| [ Total Views: 721 | Total Replies: 13 | Thread Id: 106656 ] |
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 landfall
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| posted on July 19th, 2014 at 11:08 AM |
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30-50% increase in power?
I have an oil leak in my 1976 DP 1600 bug.
If I am going to go to the trouble of removing the engine to fix it and fir the dual ICT's then I might as well consider doing it up a bit.
Not an experienced VDubber so looking for a little advice.
I would like a little more performance, good reliability for a fun machine, not a daily driver.
What parts should I be looking at for this performance?
I have read and reread the forums, purchased the book on building VW engines, etc.
If I get a list together now, I can start collecting the parts needed at a economic pace.
Thanks.
Ken
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modnrod
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| posted on July 19th, 2014 at 12:34 PM |
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You don't need to go over the top with expensive parts to get a remarkable difference.
I have had 1641cc of fire-breathing dakdak push รก Beetle to high-15s easily, while using stock cam, stock inlet manifold, and ported stock heads, all
going through a stock 1300 gearbox. Your twin ICTs would be a bit better again.
The easy way is to bump displacement with a big-bore kit. Whatever size you rekn you need, try to pick a kit with thick barrels, like 88mm thickwall
or 92mm thickwall. 88s will allow you to leave your case untouched if your bottom end is fine, 92s will need machining, then bearings, then set up
time, etc. IF you need to split the case then change the cam for better performance, if not then use 1.4 rockers on the untouched stocker.
The heads are the key. It isn't wasted money to spend $1000 on good heads for a stock motor, the difference is astonishing and through the whole
powerband, not just the top where you hardly ever go.
A stock motor on a dyno reels out mid-40HP roughly. A 88mm thickwall for 1679cc with mildly ported stock heads (L3s? CB 044 Super Mag? Pro pocket
ported?), 1.4 rockers on a stock cam, 8:1 compression, 4-1 exhaust or Vintage Speed, and your twin ICTs will crank out around 60-70HP all day.
Good fun to plan all this stuff! 
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Doug Sweetman
Veteran Volks Folk
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| posted on July 19th, 2014 at 12:43 PM |
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Good recipe and advice
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 Bizarre
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| posted on July 19th, 2014 at 01:05 PM |
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some good reading here
http://www.aircooled.net/vw-performance/
Futue te ipsum!!!
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landfall
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| posted on July 19th, 2014 at 03:31 PM |
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Thanks for the advice modnrod.
Could I please have your thoughts on a counterweight crank and balancing?
Although I DO like the idea of not splitting the case. At he moment I am in unchartered territory like a lot of other owners I suppose. The car
appears to have oil leaking from under the barrels and from the top also on cylinder number 2, weeping on number 1.
The engine has definitely been worked on, but how good a job????
Car runs OK, does not use oil to any worrying degree.
So I am not sure which way to jump. If it's not broke, why fix it?
But I do like your suggestions.
Ken
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Bizarre
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| posted on July 19th, 2014 at 05:27 PM |
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balancing is essential for a "proper" job
CW crank is for engines that rev above 6k
You can run to say 80 RWHP with a BALANCED stock crank
80 RWHP is like sub 9 sec 0-100...... fast.
Futue te ipsum!!!
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landfall
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| posted on July 19th, 2014 at 05:39 PM |
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Bizarre,
Totally agree, I have always liked a balanced engine, just seems to make sense.
What are your thoughts of lightening the flywheel? The aircooled site recommends this mod.
Big money saved by not having to go the counterbalanced route.
Thanks for the thoughts thus far, really becoming more practical, after all this is a bug with a seventy year old driver
Ken
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Bizarre
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| posted on July 19th, 2014 at 05:57 PM |
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I am against lightened flywheel
Makes the engine rev faster - to the detriment of torque
Futue te ipsum!!!
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Bizarre
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| posted on July 19th, 2014 at 05:59 PM |
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as you say - it is not really broke
I would leave as is, and save for a really good daily - say a well built 1916
Buy your parts wisely and it is not that dear
Futue te ipsum!!!
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landfall
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| posted on July 19th, 2014 at 06:14 PM |
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Thanks,
I will compile a parts list shortly and let members peruse it and point me in the right direction.
That way I can buy bits and pieces while it is going OK and be ready when I want to tackle the issues.
Ken
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Bizarre
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| posted on July 19th, 2014 at 06:41 PM |
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That's the idea
Futue te ipsum!!!
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landfall
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| posted on July 19th, 2014 at 07:18 PM |
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OK, thanks.
Another question
Cylinder heads. Reading some of the information is interesting with various thoughts and recommendations.
Should I consider doing my own heads up, say larger valves, HD springs, etc. with a little porting OR are the Chinese castings/performance heads
already assembled the go?
Ken
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Bizarre
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| posted on July 19th, 2014 at 07:35 PM |
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I would go with the CNC Los Banditos from C b Performance
Futue te ipsum!!!
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landfall
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| posted on July 19th, 2014 at 08:23 PM |
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| Quote: | Originally
posted by Bizarre
I would go with the CNC Los Banditos from C b Performance
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OK, that's where the carby kit came from.
So far I have listed:-
Cylinder heads (CBP)
Gasket Set
Flywheel seal
Flywheel Nut and washer
Rocker Gear 1:4
Mahle Barrels and Pistons 85.5
Push Rod seals
S/S Pushrods.
Ken
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