Author |
Message |
mat3833 Samba Member
Joined: May 07, 2006 Posts: 435
|
Posted: Sat Jul 21, 2007 8:11 pm Post subject: max compression ratio on 1600 DP |
|
|
ok, looking to raise the compression of my 1600 to add a little pep and take advantage of the Kadrons and new exhaust comming soon. if i remember the stock compression is 8.5:1. with higher performance engines i see 9.5:1 and 10.0:1 ratios on 93 octane. my thought is i could raise the compression and run 89 or 93 octane to gain some pep. is it worth it with a stock carb and exhaust? should i wait untill i actually get the kads and Tri-mil?
Matt _________________
grimace007 wrote: |
then i found thesamba where we point out the painfully obvious and make eachother feel retarded |
kidder = what are the pros and cons to getting more hp or less hp.
runslikeapenguin =
don3751 = Don't worry, kidder; he's rolling his eyes because he hasn't got the slightest @#$% idea.
Glenn = Owned! |
|
Back to top |
|
|
propflux01 Samba Member
Joined: June 03, 2006 Posts: 501 Location: Central Arkansastan
|
Posted: Sat Jul 21, 2007 8:26 pm Post subject: |
|
|
Not with a stock cam and it running cool.... |
|
Back to top |
|
|
stan_tichomirov Samba Member
Joined: May 24, 2005 Posts: 1719 Location: San Francisco, CA
|
Posted: Sat Jul 21, 2007 8:28 pm Post subject: |
|
|
I don't think stock compression ratio is that high, it's closer to 7something:1. Depends on the cam, heads, elevation where the car would be driven and the car's purpose. Up to 8.5:1 may be okay with something similar to Engle 110, higher may be tricky to tune, drive on the street and keep cool. My 1641 is at 8:1 with a Web 218 at sea level and I don't have cooling issues.
Stan _________________ Aircooled.net
Jansen Enterprise
My 1835cc build
My budget 2276 build |
|
Back to top |
|
|
mat3833 Samba Member
Joined: May 07, 2006 Posts: 435
|
Posted: Sat Jul 21, 2007 8:29 pm Post subject: |
|
|
well the engine is completley stock minus a 1&5/8 empi u-bend. soon to be replaced by a Tri-Mil 1& 3/8 quiet pack.
Matt _________________
grimace007 wrote: |
then i found thesamba where we point out the painfully obvious and make eachother feel retarded |
kidder = what are the pros and cons to getting more hp or less hp.
runslikeapenguin =
don3751 = Don't worry, kidder; he's rolling his eyes because he hasn't got the slightest @#$% idea.
Glenn = Owned! |
|
Back to top |
|
|
stan_tichomirov Samba Member
Joined: May 24, 2005 Posts: 1719 Location: San Francisco, CA
|
Posted: Sat Jul 21, 2007 8:42 pm Post subject: |
|
|
The 1 3/8 header would be a much better match, 1 5/8 is way too large. Raising CR you probably won't gain much without better flowing heads, carbs, and bigger cam but you will add heat. How are you planning to raise the CR, by fly-cutting the heads? I'd ask whoever would be fly-cutting them what they recommend. Your rocker geometry would change, also.
Another way to increase CR would be by adding displacement by using bigger pistons, you'd gain more torque that way for sure.
Stan _________________ Aircooled.net
Jansen Enterprise
My 1835cc build
My budget 2276 build |
|
Back to top |
|
|
vwdmc16 Samba Member
Joined: January 12, 2006 Posts: 1734 Location: sacramento, CA
|
|
Back to top |
|
|
vwracerdave Samba Member
Joined: November 11, 2004 Posts: 15280 Location: Deep in the 405
|
Posted: Sat Jul 21, 2007 9:45 pm Post subject: |
|
|
Stock compression was 6.9-7.3 depending on year. With dual kads, and everything inside the engine stock, I would not go over 7.5:1 _________________ 2017 Street Comp Champion - Thunder Valley Raceway Park - Noble, OK
2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
1997 Sportsman ET Champion - Thunder Valley Raceway Park - Noble ,OK
Featured in Dec. 2001 HOT VW's Magazine page 63
Watch my racing video's http://www.youtube.com/user/okvwracer/videos |
|
Back to top |
|
|
Hotrodvw Samba Member
Joined: July 06, 2004 Posts: 6327 Location: Orygun
|
Posted: Sat Jul 21, 2007 10:18 pm Post subject: |
|
|
Higher comp = More heat, more power, less life, harder on parts
Lower comp = Less heat, correct power, longer life, a happy engine
_________________ '67 Sunroof
Eric
78x94 with IDA's....oober fun
Horsepower is an addiction........Addictions cost
lots of money!
Hose & Fittings |
|
Back to top |
|
|
krusher Samba Member
Joined: September 24, 2002 Posts: 7652 Location: europe
|
Posted: Sun Jul 22, 2007 1:22 am Post subject: |
|
|
On desktop dyno with the stock ratio at 7.3-1 and raising it to 8.3-1 it projects a gain of 4hp at 4000rpm.
small gain for the loss of engine life.
|
|
Back to top |
|
|
mat3833 Samba Member
Joined: May 07, 2006 Posts: 435
|
Posted: Sun Jul 22, 2007 9:21 am Post subject: |
|
|
ok, thats what i needed to kno. ill just stick to stock comp ratio and add kads, the header, rockers, and a oil filter.
Matt _________________
grimace007 wrote: |
then i found thesamba where we point out the painfully obvious and make eachother feel retarded |
kidder = what are the pros and cons to getting more hp or less hp.
runslikeapenguin =
don3751 = Don't worry, kidder; he's rolling his eyes because he hasn't got the slightest @#$% idea.
Glenn = Owned! |
|
Back to top |
|
|
|