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max compression ratio on 1600 DP
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mat3833
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PostPosted: Sat Jul 21, 2007 8:11 pm    Post subject: max compression ratio on 1600 DP Reply with quote

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
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propflux01
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PostPosted: Sat Jul 21, 2007 8:26 pm    Post subject: Reply with quote

Not with a stock cam and it running cool....
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stan_tichomirov
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PostPosted: Sat Jul 21, 2007 8:28 pm    Post subject: Reply with quote

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.

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mat3833
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PostPosted: Sat Jul 21, 2007 8:29 pm    Post subject: Reply with quote

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
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grimace007 wrote:

then i found thesamba where we point out the painfully obvious and make eachother feel retarded Wink



kidder = what are the pros and cons to getting more hp or less hp.

runslikeapenguin = Rolling Eyes

don3751 = Don't worry, kidder; he's rolling his eyes because he hasn't got the slightest @#$% idea.

Glenn = Owned!
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stan_tichomirov
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PostPosted: Sat Jul 21, 2007 8:42 pm    Post subject: Reply with quote

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
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vwdmc16
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PostPosted: Sat Jul 21, 2007 9:34 pm    Post subject: Reply with quote

i believe 7.5:1 untill 72, 7.3:1 from then on.
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PostPosted: Sat Jul 21, 2007 9:45 pm    Post subject: Reply with quote

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
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Hotrodvw
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PostPosted: Sat Jul 21, 2007 10:18 pm    Post subject: Reply with quote

Higher comp = More heat, more power, less life, harder on parts
Lower comp = Less heat, correct power, longer life, a happy engine

Wink
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krusher
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PostPosted: Sun Jul 22, 2007 1:22 am    Post subject: Reply with quote

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.
Sad
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mat3833
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PostPosted: Sun Jul 22, 2007 9:21 am    Post subject: Reply with quote

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
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grimace007 wrote:

then i found thesamba where we point out the painfully obvious and make eachother feel retarded Wink



kidder = what are the pros and cons to getting more hp or less hp.

runslikeapenguin = Rolling Eyes

don3751 = Don't worry, kidder; he's rolling his eyes because he hasn't got the slightest @#$% idea.

Glenn = Owned!
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