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DOHC ZC with JG 301 cams.. No power :(

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Old Jun 11, 2007 | 02:13 PM
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I8ayellowcrayon's Avatar
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From: Fayetteville, AR, USA
Default DOHC ZC with JG 301 cams.. No power :(

I recently finished my DOHC ZC motor, and got it on the dyno... And I'm not impressed at all.

Head and block milled a total of .070" resulting in roughly 11.2:1 compression ratio
The bottom end was 'freshened up' with a hone, new rings, bearings etc.. All new seals/gaskets, any wear item was replaced, blah blah blah...

JG 301 camshafts
JG dual valvesprings
JG cam gears
stock pistons/rods
AEM CAI
DC 4-1 header
2.25" exhaust
Exedy lightened flywheel
ZC trans
completely stock PM7 ignition map, adjusted fuel map to set AFRs

I degreed the cam lobe centers to 108* as Javier at JG said to set them at. The engine was properly broken in, runs great, but won't idle.

Anyways, took it to the local Dyno Jet and ended up with 124hp/107tq on the best run. My previous motor (stock Y7; completely stock internals) felt just as strong as this ZC. I didn't adjust the cam timing at all while on the dyno, because I was under the impression that only minor adjustments are needed once the cams are degreed, so I didn't want waste my time and money.

I know there's always a difference between dyno's and differences even on different days and all that, but I keep seeing people making more power with less mods on the DOHC ZCs and I'm just wondering what I'm doing wrong, or if I got some bad information or what. I have seen an engine with stock compression, these cams (just dropped in, not degreed) get 112hp, and basically the same setup elsewhere.

My main question is, should I have to adjust the cams anymore since they're degreed? I just don't want to waste time/money at the dyno to not make any power. Also, I did degree the cams after the milling, so they are correctly degreed for the current setup.

Thanks in advance for any help and information!

Jason
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