| [ Total Views: 77250 | Total Replies: 111 | Thread Id: 18694 ] |
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 Baja Wes
Bishop of Volkswagenism
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| posted on March 3rd, 2004 at 03:35 PM |
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That is not a torque curve, it is a force at the surface of the roller. That is why it is in lbs.
I will calculate a torque curve...
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Baja Wes
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| posted on March 3rd, 2004 at 04:01 PM |
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We'll remember that earlier I said...
| Quote: | Originally
posted by Baja Wes
stop quoting the 700lbs, it's got nothing to do with the engine.
121.5HP @ 6000rpm equates to 106 ft.lbs of torque.
The peak torque is usually produced lower in the rev range than the peak power so peak torque will be more than 106ft.lbs, my guess is prob close to
120ft.lbs.
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Well my guess was good. That HP graph translates to a peak torque of almost 118ft.lbfs @ approx 4900rpm.
Anyway, here is the HP and torque curve, plotted against all the other dyno sheets people have provided recently. Troy's engine has more torque
everywhere, but doesn't rev as well as Craig's or Greg's cars.
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56astro
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| posted on March 3rd, 2004 at 04:10 PM |
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u da Man, Wes
:thumb
VW car, VW engine ...... keepin it "real"
35MPG on 101.3kPa |
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jakriz
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| posted on March 3rd, 2004 at 05:59 PM |
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| Quote: | Originally
posted by Baja Wes
We'll remember that earlier I said...
| Quote: | Originally
posted by Baja Wes
stop quoting the 700lbs, it's got nothing to do with the engine.
121.5HP @ 6000rpm equates to 106 ft.lbs of torque.
The peak torque is usually produced lower in the rev range than the peak power so peak torque will be more than 106ft.lbs, my guess is prob close to
120ft.lbs.
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Well my guess was good. That HP graph translates to a peak torque of almost 118ft.lbfs @ approx 4900rpm.
Anyway, here is the HP and torque curve, plotted against all the other dyno sheets people have provided recently. Troy's engine has more torque
everywhere, but doesn't rev as well as Craig's or Greg's cars.
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excellent graph Wes, would be interesting to see what mine would put out with more than 9.0:1 compression, maybe 10.8:1 is on the cards then:thumb
will be interesting to see what Craig & Greg get after a dyno tune at CBB
Jak
Congratulations to Ben Durie for breaking the hillclimb record at Ringwood in his stroker beetle!
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jakriz
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| posted on March 4th, 2004 at 05:22 AM |
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I thought someone said that Greg has already been?
Jak
Congratulations to Ben Durie for breaking the hillclimb record at Ringwood in his stroker beetle!
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Baja Wes
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| posted on March 4th, 2004 at 08:49 AM |
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| Quote: | Originally
posted by Craig Torrens
Greg Wards 1916cc, dyno was done on a 40Deg C day,room temp on graph is 37 Deg C, not the best for making power !!
(about 10% power loss due to heat)
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That's the thing with shoot-out mode. It will compensate for the temperature. So really it shouldn't make any more power on a cooler day,
because the temp has already been accounted for. You can see on the bottom of the graph it recorded the room temp and relative humidity and tried to
compensate for that. Whether it compensates correctly for an air-cooled VW is another matter entirely.
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Baja Wes
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| posted on March 4th, 2004 at 10:27 AM |
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I have remade the graphs to suit Greg's latest 111.7HP dyno read out.
The first attachment is Greg's current graph against his old graph. You can see it on his dyno plot that shows the air fuel ratio, that there is
a rich spot in the rev range at ~4350rpm. This corresponds to a dip in the power curve at the same point, obviously hurting HP. You can see just how
much it is hurting from the comparison of his old and new HP curves. There is definitely some more midrange to be gained with correct jetting.
The next one is all 4 VW engines against each other, but with Gregs latest chart instead of his old one.
Troy's engine is weird. It has more torque everywhere. Either it has higher compression than the other engines, bigger capacity, or a more
efficient gearbox. A more efficient gear could be due to different helix angle gears, or just a gearbox and CV's in better condition (and
CV's running less angle), could even be due to better gearbox oil (thinner with less friction?)
[Edited on 4-3-2004 by Baja Wes]
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VWCOOL
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| posted on March 4th, 2004 at 11:10 AM |
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ooooh a dyno curve gang-bang!:thumb
Pay your debts, CxxT
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72ghiacab
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| posted on March 4th, 2004 at 09:11 PM |
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While we're on the topic of 1916's
In 1990 (I think) I purchased a 1916 from Stan. In '93 or '94 it snapped the head off a valve at 100kms on the freeway. One head, one barrel
and piston immediately shagged, and then after teardown I sent the case for a soak and the nice gentlemen left it in the acid bath too long. Case was
stuffed. Rebuild was getting too expensive compared to replacement stocker to get on the road again. The beetle is long gone but I still have the
remainder of the 1916 parts. I can't remember the cam grind, I'd have to drag out some old paperwork. Do you 1916 gurus reckon it's
worth rebuilding, or have too many advances been made in "1916 technology" in that time? Where would I buy one barrel and one piston from
anyway? I also found the cam a bit of a dog on hot days - wouldn't idle. Used to sound great, but!!!!!!
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72ghiacab
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| posted on March 4th, 2004 at 09:41 PM |
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Yeah but is the same thing going to happen? (rhetorical question)
Does Stan use different valve stems now?
Has he moved on from the cam grinds of that era? I spose I should ring him, but I'm only just thinking about this now...don't really have
time to ring during the day....maybe I'd better make some time..
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56astro
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| posted on March 4th, 2004 at 10:05 PM |
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I think I might of seen that acid-dipped engine case lying around somewhere in a workshop. Would that be yours?
:jesus
VW car, VW engine ...... keepin it "real"
35MPG on 101.3kPa
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jakriz
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| posted on March 5th, 2004 at 04:33 AM |
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my fathers new beetle in 68 dropped a valve after 1 week, it could happen to anyone, anywhere, anytime, regardless of who built it.
Do a rebuild & get another hot vw on the streets!
regards
Jak
Congratulations to Ben Durie for breaking the hillclimb record at Ringwood in his stroker beetle!
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 Peter Leonard
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| posted on March 7th, 2004 at 05:22 PM |
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can't wait to see my dyno. pretty much the same as troy's but only a few months old probably won't make a lot of difference, knowing how well stan's motor's retain HP. when I get it, can I
have a snot green curve to match my sleeper, Wes?
let sleeping dubs lie
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Baja Wes
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| posted on March 8th, 2004 at 08:28 AM |
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for you Pete, anything.
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Peter Leonard
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| posted on March 8th, 2004 at 05:07 PM |
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woohoo!!
:bounce
let sleeping dubs lie
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jakriz
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| posted on April 8th, 2004 at 01:34 AM |
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Lucky u reposted the graph Craig, some of us almost forgot. U should have reminded us more often.
Its an awesome result Craig, I doubt very much anyone would try to take it away from Stan & his engine building skills. Maybe in another 20 years
when I have built more than 6 engines I can get a result similar.
See u on Saturday
regards
Jak
Congratulations to Ben Durie for breaking the hillclimb record at Ringwood in his stroker beetle!
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Craig Paton
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| posted on September 14th, 2004 at 01:59 PM |
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Craig
Is this twin plug??
Craig :sandrine |
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Tony Draper
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| posted on September 14th, 2004 at 05:16 PM |
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Pobjoy 120 hp+
All this talk, why not just buy mine, ready to go! See my add on the forum or come for a demo drive. Call me 0410 323 020.
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Craig Torrens
A.k.a.: Craig Torrens
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| posted on September 14th, 2004 at 09:01 PM |
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| Quote: | Originally
posted by Craig Paton
Craig
Is this twin plug??
Craig :sandrine
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No.............not yet.
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Craig Paton
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| posted on September 14th, 2004 at 09:41 PM |
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That'll make an interesting comparison !!!
Twin Plug or not to twin plug,
That is the question ????????????????
:vader |
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type2nut
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| posted on September 14th, 2004 at 09:53 PM |
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Do any of you know if Mr. Pobjoy has ever tried playing with a waterboxer?
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HotRodMatt
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| posted on September 17th, 2004 at 11:05 AM |
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| Quote: |
Rudy Frank (silver race bug) managed a 126.6hp from his 1916cc pobjoy spec last Friday
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I thought Rudy built his own engine?
The combination had been changed again since his last dyno session?
And from what I heard we should expect even more out of his current engine with some more sorting! Can't wait to see that!
I think a day at the roundy-roundies might be coming up...
[Edited on 17-9-2004 by HotRodMatt]
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