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Location:
Brisbane
Registered:
February 2003
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Re: whats involved in lowering compression?
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Sat, 26 March 2005 12:34
 
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gee... this sounds familiar ...
seriously now: my 18RC was lowered to 7.4:1 by machining out the head only.
i'm guessing that you're sick of people telling you not to turbo an 18RC - but i can tell you that it's an interesting, if regularly frustrating journey 
suggestion? get a stuffed head from the wreckers to practice on - you want to avoid taking out the squish area in the head - it looks like just the thing do to easily lower compression but doing so you make the engine extremely prone to pinging & detonation.
if you had the money, some custom-machined dished pistons would help but you if then result in removing the 'squish' area you're still prone to detonation/pinging.
avoid the de-comp plate, unless you run copper gaskets with o-rings/grooves, you'll blow them whenever you get over about 5-6psi (this is oral history not personal experience).
unless you're running fuel & spark from a computer and can boost-retard the ignition, i'd also look at water injection to control combustion speed at high boost levels. you'll also find that a decent intercooler will help.
cheers,
thechuckster.
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| | Subject | Poster | Date |
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whats involved in lowering compression?
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Rumble | Sat, 26 March 2005 05:32 |
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Re: whats involved in lowering compression?
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mideon_696 | Sat, 26 March 2005 05:48 |
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Re: whats involved in lowering compression?
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4agte | Sat, 26 March 2005 06:17 |
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Re: whats involved in lowering compression?
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jesseT18 | Sat, 26 March 2005 07:33 |
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Re: whats involved in lowering compression?
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towe_001 | Sat, 26 March 2005 12:13 |
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Re: whats involved in lowering compression?
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thechuckster | Sat, 26 March 2005 12:34 |
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Re: whats involved in lowering compression?
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Rumble | Sat, 26 March 2005 10:38 |
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Re: whats involved in lowering compression?
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jesseT18 | Sat, 26 March 2005 11:50 |
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Re: whats involved in lowering compression?
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Rumble | Sat, 26 March 2005 14:16 |
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Re: whats involved in lowering compression?
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thechuckster | Sat, 26 March 2005 16:21 |
