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 4agedub
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| posted on November 12th, 2012 at 04:24 PM |
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2276cc or 2332cc ???
I'm considering building a big cc engine to use in my circuit race bug for the open events. But what combo? 82 or 84 stroke.
I do have a ally bubble case, so the case is not an issue. Do you need to machine the camshaft for a 84 stroke with chev big ends?
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70AutoStik
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| posted on November 12th, 2012 at 06:20 PM |
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Yes, I believe you will need to clear the camshaft for an 84 stroke. Chev journals and the right conrods will reduce the amount required, but you will
probably still find it will hit.
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Super1302
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| posted on November 12th, 2012 at 06:38 PM |
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No you do not have to clear the cam shaft, since i have a bubble top with what you are wanting to do.
i have 94 x 84 with chev journals.
no issues here
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 matberry
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| posted on November 12th, 2012 at 07:08 PM |
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No probs depending on the cam, Engle will possibly need clearancing depending on rods, but it's not a big deal, Scat and many others have thier cams
preclearanced. My last big build was 88 x 94 and although some clearancing necessary it's not that difficult. Even a bubble top case needs checking.
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
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4agedub
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| posted on November 12th, 2012 at 10:57 PM |
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The setup that I'm looking at is either:
1.
Ally high roof case
82mm CB super race cromoly crank
H-beam rods VW journal
Engle fk89 cam
Wiseco slipper 94mm pistons / mahle barrels
CB Wedge Port Cylinder Heads - 44x37.5mm
Big beef intakes with 48mm ida carbs
2.
Ally high roof case
84mm CB super race cromoly crank
H-beam rods chevy journal
Engle fk89 cam
Wiseco slipper 94mm pistons / mahle barrels
CB Wedge Port Cylinder Heads - 44x37.5mm
Big beef intakes with 48mm ida carbs
The engine will operate between 5000 - 7000rpm with my current gear ratios on the track. The ratios are:
1 2.06
2 1.611
3 1.318
4 1.12
FD 3.875
225/50/15"
We only do 8 lap sprint races, so no enduro stuff.
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cnfabo
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| posted on November 12th, 2012 at 11:30 PM |
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here is a teaser for you http://www.youtube.com/watch?v=HzD9Rfl-LwQ&feature=channel&list=UL
that is a lot of rubber,do you need such a wide tyre?
your combo sounds like it'd be ripper...
with your current setup what are doing for cooling "whoops off topic" and how hot is your oil getting doing 8 laps.
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4agedub
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| posted on November 13th, 2012 at 02:43 AM |
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That bug sounds pretty cool. There's a lot of torque
In my class I run with cars that's got more hp than me, so the only way to beat them is through the corners... thus the wide rubber. 
http://www.youtube.com/watch?v=ekHM0InIm8o
I'm using a doghouse cooler with one oil cooler underneith the rear window and one cooler in the front. The cooler in the front was made from a
intercooler core and is on the dry sump return line. The whole system takes about 15lt of oil. Oil temp goes up to about 105'c on the 30'c outside temp days.
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4agedub
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| posted on November 13th, 2012 at 02:46 AM |
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Here's some pics of the oil coolers
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matberry
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| posted on November 13th, 2012 at 07:59 AM |
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| Quote: | Originally
posted by 4agedub
The setup that I'm looking at is either:
1.
Ally high roof case
82mm CB super race cromoly crank
H-beam rods VW journal
Engle fk89 cam
Wiseco slipper 94mm pistons / mahle barrels
CB Wedge Port Cylinder Heads - 44x37.5mm
Big beef intakes with 48mm ida carbs
2.
Ally high roof case
84mm CB super race cromoly crank
H-beam rods chevy journal
Engle fk89 cam
Wiseco slipper 94mm pistons / mahle barrels
CB Wedge Port Cylinder Heads - 44x37.5mm
Big beef intakes with 48mm ida carbs
The engine will operate between 5000 - 7000rpm with my current gear ratios on the track. The ratios are:
1 2.06
2 1.611
3 1.318
4 1.12
FD 3.875
225/50/15"
We only do 8 lap sprint races, so no enduro stuff.
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We could talk cam's and head choices for many hours and really there are many choices and combo's that get effected by the engine externals, intake,
exhaust etc.., but what I would definately recommend would be to upgrade the crankshaft. For your race application and rpm, the best choice would be
Scat Ultra-light with type 4 centre main as a minimum requirement. I like to build for longevety, and the cranks with type 4 mains are way stronger
and more stable for sustained rpm. Minimising recipricating weight is of high priority ie. crank, rods and pistons.
From your above options, I'd go for #1 because of the stronger crank with less stroke and VW journals.
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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bigrudi
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| posted on November 15th, 2012 at 05:27 PM |
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Just fit a turbo to what you have Then u will have some usable power FK 89 mainly suited to drag application not circuit nobottom till 5000 then comes
on like sledge hammer.2275 vw journals make sure u prep the hi top case and use the grooved metal backed centre maincheers Rudi
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4agedub
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| posted on November 15th, 2012 at 05:40 PM |
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None of the competitive race classes allow for turbo charging. Otherwise
that would've been an option. I think the first option might be to get a little extra power from my current setup, right now the fk89 is not working
like it should... I think the cylinder heads are a problem. It makes max power at 6300rpm and then dropps dead.
Has anyone here used the CB ultra wedge port heads before? Are they bolt on / go or do you still need to grind on the ports before use?
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cnfabo
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| posted on November 15th, 2012 at 06:23 PM |
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..what about the superpro's with more port volocity for your small engine.
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Craig Torrens
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| posted on November 15th, 2012 at 10:12 PM |
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what heads are you using now ?
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4agedub
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| posted on November 16th, 2012 at 03:36 AM |
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CB 044 super mag with 42 / 37 valves, 1.25:1 rockers, 48ida on big beef manifolds and 1 7/8" header
I think there's either a problem with the porting or valve springs right now...
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4agedub
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| posted on November 16th, 2012 at 03:49 AM |
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Here's a pic of the combustion chamber, I'll try and find some pics of the intake ports
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matberry
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| posted on November 16th, 2012 at 08:00 AM |
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CB springs don't last long IMO
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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cnfabo
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| posted on November 16th, 2012 at 08:39 AM |
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I use cb650 springs and rev mine to 8000 and never have had a valve float.
Your exhaust is big.maybe try a 1 5/8". Anyway your engine sounds great and goes hard on all the videos I have seen
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sander288
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| posted on November 16th, 2012 at 10:09 AM |
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| Quote: | Originally
posted by cnfabo
I use cb650 springs and rev mine to 8000 and never have had a valve float.
Your exhaust is big.maybe try a 1 5/8". Anyway your engine sounds great and goes hard on all the videos I have seen
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I thought the same; I've never seen a 1 7/8 on a track car; probs get more use-able power if it's reduced a bit
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Craig Torrens
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| posted on November 16th, 2012 at 10:38 AM |
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| Quote: | Originally
posted by 4agedub
CB 044 super mag with 42 / 37 valves, 1.25:1 rockers, 48ida on big beef manifolds and 1 7/8" header
I think there's either a problem with the porting or valve springs right now...
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There's one of your problems.....the inlet port on the super mags is to small to create power in the upper rpm range. It doesn't matter what cam you
use peak HP will be around the 6100-6300rpm range.You will find that if you use the Wedgeports your peak power range will jump up by around
1000rpm.
Your exhaust is large, but I wouldn't be fussed changing that as you're chasing upper rpm power for circuit racing.
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bat69
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| posted on November 16th, 2012 at 12:18 PM |
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| Quote: | Originally
posted by Craig Torrens
| Quote: | Originally
posted by 4agedub
CB 044 super mag with 42 / 37 valves, 1.25:1 rockers, 48ida on big beef manifolds and 1 7/8" header
I think there's either a problem with the porting or valve springs right now...
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There's one of your problems.....the inlet port on the super mags is to small to create power in the upper rpm range. It won't matter what cam you
use peak HP will be around the 6100-6300rpm range.You will find that if you use the Wedgeports your peak power range will jump up by around
1000rpm.
Your exhaust is large, but I wouldn't be fussed changing that as youre chasing upper rpm power for circuit racing.
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I have used both these heads and Craig your 100% right. The max HP was slightly over 1000rpm higher in the rev range and fair increase in HP too after
switching from the super mag to the wedge port. Nothing else changed on the eng's apart from heads.
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vassy66T1
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| posted on November 16th, 2012 at 03:47 PM |
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Nice info shared guys 
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Craig Torrens
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| posted on November 16th, 2012 at 04:15 PM |
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Happy to share 
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4agedub
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| posted on November 16th, 2012 at 10:56 PM |
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Thank you for the info, normally it's just trial and error as no one in the beetle community like to share info.
I have tried a 1 5/8" header as well, the 1 7/8" made the same power. I have also tried 38mm choke tubes, no big difference there either.
The midrange power is pretty good right now, but only up to 6300... at 6300rpm it makes around 95kw on the wheels on a dastek chassis dyno. (1600m
above sea level, no correction). At 6500rpm it's already down to 85kw which is crap.
The cam has been dialed in to the cam card. I have not really tried moving the cam around too much though.
The ignition timing has been power tuned and ended off at 29' advance from 3500rpm. More timing = less power, less timing = less power. The AFR
ratios are at 12,8:1 wot which is perfect.
Compression ratio is around 12:1. I can go higher if needed, there's no det.
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Gracey
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| posted on November 17th, 2012 at 03:03 PM |
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What size is your current engine??
Also how well does the intercooler.... err I mean oil cooler work??
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4agedub
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| posted on November 17th, 2012 at 03:18 PM |
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Currently it's 2165cc
Previously i used two big setrab oil coolers plumbed up in serie, then changed to the home made intercooler setup. The oil temp went down by about
10'c and the dry sump return line pressure went down as well due to less restricion from the big intercooler setup. It was well worth the effort and
cheaper than a big setrab oil cooler.
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4agedub
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| posted on November 17th, 2012 at 03:21 PM |
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Current setup is:
Cb 78mm super race crank
Cb h beam rods
Wiseco 94's in mahle barrels
Fk89 cam with cb big foot lifters
Cb 044 super mag 42, 37 valves. 1,25 rockers
Big als 1 7/8" header with 2,5" silencer
Cb big beef intakes with 48ida, 42 chokes
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matberry
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| posted on November 17th, 2012 at 03:27 PM |
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And how was the porting in the pics finished? Certainly far from finished in the pics.
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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hellbugged
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| posted on November 17th, 2012 at 03:59 PM |
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Yeah id like to see it with smaller vents and headers with those valves and ports
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cnfabo
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| posted on November 17th, 2012 at 04:20 PM |
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| Quote: | Originally
posted by 4agedub
Current setup is:
Cb 78mm super race crank
Cb h beam rods
Wiseco 94's in mahle barrels
Fk89 cam with cb big foot lifters
Cb 044 super mag 42, 37 valves. 1,25 rockers
Big als 1 7/8" header with 2,5" silencer
Cb big beef intakes with 48ida, 42 chokes
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Oh I thought you ran a 1916 or 1776.chuck some wedge ports on it
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4agedub
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| posted on November 17th, 2012 at 07:26 PM |
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I'll try to fin some pics of the heads finished, those pictures were while in process but shows the port shape and size.
I've tried it before with 38 chokes and the smaller exhaust. No power increase.
Are the wedge ports the right choise? Or should i look at another brand?
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