Question about my 427
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On The Tree
Joined: Nov 2004
Posts: 116
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From: middle east kuwait
Question about my 427 With a proper tune this should not be a problem with 98 octanes?
cranck shaft callies 4.000
rods H-PEM eagle 6.125
piston je pore 4.000 cerameck coated dome volume +10 custom
gaskets cometic pore 4.160 thickness 61
heads afr 225 cc flow 350 2.080 1.060
oil pumps slp
pore 4.125
strock 4.000
cylinder 8
piston volume + 10 dome
heads 72
gaskets th. 0.0 61
= cui. 428
= liters 7.01
= Compression 12.59
cranck shaft callies 4.000
rods H-PEM eagle 6.125
piston je pore 4.000 cerameck coated dome volume +10 custom
gaskets cometic pore 4.160 thickness 61
heads afr 225 cc flow 350 2.080 1.060
oil pumps slp
pore 4.125
strock 4.000
cylinder 8
piston volume + 10 dome
heads 72
gaskets th. 0.0 61
= cui. 428
= liters 7.01
= Compression 12.59
Last edited by mohammed_k81; Dec 30, 2007 at 02:12 AM.
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
With a proper tune this should not be a problem with 93 octanes?
cranck shaft callies 4.000
rods H-PEM eagle 6.125
piston je pore 4.000 cerameck coated dome volume +10 custom
gaskets cometic pore 4.160 thickness 61
heads afr 225 cc flow 350 2.080 1.060
oil pumps slp
pore 4.125
strock 4.000
cylinder 8
piston volume + 10 dome
heads 72
gaskets th. 0.0 61
= cui. 428
= liters 7.01
= Compression 12.59
cranck shaft callies 4.000
rods H-PEM eagle 6.125
piston je pore 4.000 cerameck coated dome volume +10 custom
gaskets cometic pore 4.160 thickness 61
heads afr 225 cc flow 350 2.080 1.060
oil pumps slp
pore 4.125
strock 4.000
cylinder 8
piston volume + 10 dome
heads 72
gaskets th. 0.0 61
= cui. 428
= liters 7.01
= Compression 12.59
What is your dynamic compression, I run 12:1 on our 98 Octane (dubai) with no issues.
What is your piston to deck height value (in or out of hole and by how much)
Also I would run TR6 or similar 1 step or 1.5 step COLDER plug gapped at .035>.040
Last edited by PREDATOR-Z; Dec 29, 2007 at 01:27 PM.
93 PON or 93 RON? Big difference in those two fuels. If it is not PON, then you need to find the average of the RON and the MON. Over here, we use PON exclusively. I know some overseas stuff is only RON, so be carefull.
It would still be iffy even on 93PON. You would have to have a really conservative spark call. It sounds like a great combo for E-85, but I am 99% sure that isn't available to you.
It would still be iffy even on 93PON. You would have to have a really conservative spark call. It sounds like a great combo for E-85, but I am 99% sure that isn't available to you.
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
93 PON or 93 RON? Big difference in those two fuels. If it is not PON, then you need to find the average of the RON and the MON. Over here, we use PON exclusively. I know some overseas stuff is only RON, so be carefull.
It would still be iffy even on 93PON. You would have to have a really conservative spark call. It sounds like a great combo for E-85, but I am 99% sure that isn't available to you.
It would still be iffy even on 93PON. You would have to have a really conservative spark call. It sounds like a great combo for E-85, but I am 99% sure that isn't available to you.
it is good sh*t. As i mentionned I run 8.9 DCR, 12:1 SCR, TR6 plugs and that pump stuff and i can still shoot 100 shot nitrous with no knock. I do have a tight quench at .035 though and almost 0 oil burn contamination. 26* max spark advance
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TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Yaeh, just start with lower spark advance and a bit more fuel the adjust as necessary.
I would say start with 24/25* range and increase a little at a time. Once you get knock reduce by 1* and that should be the range of operation. If it detonates too much at low timing, then add race fuel and monitor change.
just be careful, mistakes at WOT can be costly.
I would say start with 24/25* range and increase a little at a time. Once you get knock reduce by 1* and that should be the range of operation. If it detonates too much at low timing, then add race fuel and monitor change.
just be careful, mistakes at WOT can be costly.
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