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would a fully rebuild 4.2L be worth the cost to build is it was to be kept NA. and maybe some nitrous? what kinda of power would 11:1 compression see? is 300 rwhp possible?
 

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¡ʇsnq ɹo uʍop ǝpısdn
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that seems kinda high compression wise... and naturally aspirated ... that might be a small stretch... will take some great tuning and ****
 

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......................and maybe some nitrous?
 

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MM's Mad Scientist
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Using a higher compression is a proven way to bild HP, bt you have to be careful with your combustion chambers in order to control your flame front.
 

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do it right you could hit 300
take out a nice loan
 

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¡ʇsnq ɹo uʍop ǝpısdn
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... but your kinda missing the point... a little, with higher compression you need higher octane fuel... i believe the highest compression you will want to run is 10.5:1 and that has to be on 93 octane fuel or else youll start having problems and knocking and **** 11:1 you will need to find a place that sell 104 or something 93 wont be enough, unless you build it just right
 

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MM's Mad Scientist
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... but your kinda missing the point... a little, with higher compression you need higher octane fuel... i believe the highest compression you will want to run is 10.5:1 and that has to be on 93 octane fuel or else youll start having problems and knocking and **** 11:1 you will need to find a place that sell 104 or something 93 wont be enough, unless you build it just right
I see what you're trying to say, but I'm saying that you may not know al the facts.

Fact: I just got out of car. It has a full tank of 93 octane fuel from Sunoco. It is running great. It has 11.6:1 compression.
 

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¡ʇsnq ɹo uʍop ǝpısdn
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you have a 4.6, an over head camm'd engine, I know that is possible... but i would advise against it 10.5:1 >11:1 for him ... IMO
 

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I see what you're trying to say, but I'm saying that you may not know al the facts.

Fact: I just got out of car. It has a full tank of 93 octane fuel from Sunoco. It is running great. It has 11.6:1 compression.
acmillr

omz is right dude.
unfortunetly 10:5:1 is about the highest to go safely on the pump:(
for us
 

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¡ʇsnq ɹo uʍop ǝpısdn
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acmillr

omz is right dude.
unfortunetly 10:5:1 is about the highest to go safely on the pump:(
for us
its okay acm :hug


bah just playin... engines are different, your 4.6 and my 3.8 react differently to high compression... you wouldn't know that mine can't handle it, i wouldn't know that yours can...

its all good,

but suriusly
 

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MM's Mad Scientist
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acmillr

omz is right dude.
unfortunetly 10:5:1 is about the highest to go safely on the pump:(
for us
Send a pair of old head cores and I can show you how to manage the flame front. You probably can't manage 11:1 on a stock combustion chamber, but there are ways to engineer the problem out.
 

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¡ʇsnq ɹo uʍop ǝpısdn
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Send a pair of old head cores and I can show you how to manage the flame front. You probably can't manage 11:1 on a stock combustion chamber, but there are ways to engineer the problem out.
oh see now your cheating :(


;)
 

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MM's Mad Scientist
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its okay acm :hug


bah just playin... engines are different, your 4.6 and my 3.8 react differently to high compression... you wouldn't know that mine can't handle it, i wouldn't know that yours can...

its all good,

but suriusly
The 4.6's can't handle without a worked chamber........
 

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Send a pair of old head cores and I can show you how to manage the flame front. You probably can't manage 11:1 on a stock combustion chamber, but there are ways to engineer the problem out.
you can talk with super six motor sports
they've done a n/a nitours car
and they're doing another
both are 10:5:1
trust me thats the safest on pump for us
 
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