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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

high compression LT1 guys

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Old 08-18-2008, 11:23 PM
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Default high compression LT1 guys
what are you using for starter motors.I just blew apart my 3rd stock one.compression is 13.7
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Old 08-18-2008, 11:51 PM
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Originally Posted by Dave J
what are you using for starter motors.I just blew apart my 3rd stock one.compression is 13.7
Wow, how long did that motor last you?

I'm still learning LTx stuff, so I'm in for good tech advice.
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Old 08-19-2008, 12:03 AM
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I have 12.0 to 1 compression With a Powermaster XS Torque Starter. It works Great!
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Old 08-19-2008, 01:25 AM
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powermaster here torque master it will crank up to 18-1
it has a gear reduction like 4-1 something like that and it cranks fast..
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Old 08-19-2008, 07:10 AM
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Still doing well with a stock starter on 12.3 cr. No problems with a good ground and a fresh battery. I broke a few starters a while back. I mean I BROKE them. Hit the switch and after about 1/2 a rev the starter nose cone would go "clang" on the driveway. Turned out the opti cap was cross firing and really screwing things up. No problems after that (till the opti itself took a dump on the trailer at the LTx Nationals).

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Old 08-19-2008, 07:29 AM
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w/ a 11.25 to 1 street comp, used CSR mini starter w/o issue.
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Old 08-19-2008, 07:58 AM
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13.7:1 ?? Damn!

I am at 12.3:1 using an LT4 starter. Works fine. I am about to lower my CR to 11.5:1
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Old 08-19-2008, 08:46 AM
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Originally Posted by Tony Shepherd
13.7:1 ?? Damn!

I am at 12.3:1 using an LT4 starter. Works fine. I am about to lower my CR to 11.5:1

More Juce?

Mec
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Old 08-19-2008, 09:15 AM
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Originally Posted by Greaseymec
More Juce?

Mec
Higher quench, slightly less compression, E85 (maybe), and more juice.
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Old 08-19-2008, 09:25 AM
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11.8 : 1 here, stock starter, no problems.
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Old 08-19-2008, 10:03 AM
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I will give the powermaster a shot thanks for the help guys
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Old 08-19-2008, 10:30 AM
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Do you run on 100 or 110?
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Old 08-19-2008, 11:00 AM
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Originally Posted by slick1851
Do you run on 100 or 110?
112 unleaded
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Old 08-19-2008, 12:06 PM
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PowerMaster XS also 12.5 to 1 with perfect quench
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Old 08-19-2008, 12:28 PM
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I am going to have to remember this, higher compression in the future. Good info here guys, looks like that PowerMaster XS is the way to go.
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Old 08-19-2008, 01:18 PM
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my car's compression is stock as far as i know. My bro told me to make some real boost use aviation fuel but put 2 stroke oil in with it to, cause Aviation fuel has no additive's
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Old 08-19-2008, 01:22 PM
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lol wow 13.7 thats high. powermasters are good though
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Old 08-19-2008, 03:52 PM
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Originally Posted by Kmaroman
my car's compression is stock as far as i know. My bro told me to make some real boost use aviation fuel but put 2 stroke oil in with it to, cause Aviation fuel has no additive's
only use 1 ounce of jetA in a tank. my dad used to use it in his jeep, and it never had clogged injectors
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Old 08-19-2008, 07:04 PM
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Originally Posted by Revelation Z28
only use 1 ounce of jetA in a tank. my dad used to use it in his jeep, and it never had clogged injectors
Jet A is not gonna help any. Its really just a high grade kerosine.

Originally Posted by Kmaroman
my car's compression is stock as far as i know. My bro told me to make some real boost use aviation fuel but put 2 stroke oil in with it to, cause Aviation fuel has no additive's
Be careful. Av gas is full of additives. Also, even the low lead stuff has WAY to much lead for O2 sensors and cats. 21 years in aviation. FWIW

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Old 08-19-2008, 09:24 PM
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Originally Posted by SVTJayhawk
Wow, how long did that motor last you?

I'm still learning LTx stuff, so I'm in for good tech advice.
Reverse flow cooling means our heads are cooled first, allowing LT1s to run a lot higher compression then standard engines without detonation.

My rebuild will be shooting for 12.5:1, and my stock shortblock ran close to 11.1:1 on pump gas.

The tune makes a world of difference as well.
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