how big can you go in a SOHC?
08-25-2003, 03:39 PM
#2
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Re: how big can you go in a SOHC? (GSRswapandslow)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GSRswapandslow »</TD></TR><TR><TD CLASS="quote">Ok, i'm going to build my single for boost. I'm goin with a d15 crank and long rods. I'm also goin to sleeve it while doing this. How big of a bore do most ppl got? All I'm seein is 77mm....is that it?
</TD></TR></TABLE>
I recommend NOT using the d15 crank. The d15 crank has small main/rod journals. The larger bearings (in the d16) is going to help keep the motor together in a high hp application.
And you can go as high as 79mm or even 80mm, but with a turbo applicaiton its not recommended for strength. The highest golden eagle recommends is 77mm in a boosted application.
If you really want power outa a d-series, use a d16, sleeve it to 77mm, 10:1 pistons, port the head like only monica lewinsky knows how, use a huge turbo and boost it to the moon.
liam
</TD></TR></TABLE>
I recommend NOT using the d15 crank. The d15 crank has small main/rod journals. The larger bearings (in the d16) is going to help keep the motor together in a high hp application.
And you can go as high as 79mm or even 80mm, but with a turbo applicaiton its not recommended for strength. The highest golden eagle recommends is 77mm in a boosted application.
If you really want power outa a d-series, use a d16, sleeve it to 77mm, 10:1 pistons, port the head like only monica lewinsky knows how, use a huge turbo and boost it to the moon.
liam
08-25-2003, 03:47 PM
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Re: how big can you go in a SOHC? (liam821)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by liam821 »</TD></TR><TR><TD CLASS="quote">
port the head like only monica lewinsky knows how</TD></TR></TABLE>
dood... i LITERALLY fell off my chair laffing at that one hahahahahahahahah
port the head like only monica lewinsky knows how</TD></TR></TABLE>
dood... i LITERALLY fell off my chair laffing at that one hahahahahahahahah
08-25-2003, 03:53 PM
#4
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actually, all the fastest SOHCs run the d15 crank
there are two different cranks. one large and one small.
and the reason i'm going to use it is so i can run a long rod and actually rev it and make power, unlike 99% of ppl that build them, i'm doing it RIGHT.
so, 77mm seems to the be the limit? Guess I'll have to find out....i'm thinking about 79mm, 10.5:1, and a larger turbo..maybe a straight t4.
but thanks for the help
there are two different cranks. one large and one small.
and the reason i'm going to use it is so i can run a long rod and actually rev it and make power, unlike 99% of ppl that build them, i'm doing it RIGHT.
so, 77mm seems to the be the limit? Guess I'll have to find out....i'm thinking about 79mm, 10.5:1, and a larger turbo..maybe a straight t4.
but thanks for the help
08-25-2003, 03:55 PM
#6
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Re: (GSRswapandslow)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GSRswapandslow »</TD></TR><TR><TD CLASS="quote">actually, all the fastest SOHCs run the d15 crank
there are two different cranks. one large and one small.</TD></TR></TABLE>
I was under the impression that all the d15 cranks had small main/rod journals. Which d15 crank are you going to be using?
liam
there are two different cranks. one large and one small.</TD></TR></TABLE>
I was under the impression that all the d15 cranks had small main/rod journals. Which d15 crank are you going to be using?
liam
08-25-2003, 04:26 PM
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Re: (GSRswapandslow)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GSRswapandslow »</TD></TR><TR><TD CLASS="quote">actually, all the fastest SOHCs run the d15 crank
there are two different cranks. one large and one small.
and the reason i'm going to use it is so i can run a long rod and actually rev it and make power, unlike 99% of ppl that build them, i'm doing it RIGHT.
so, 77mm seems to the be the limit? Guess I'll have to find out....i'm thinking about 79mm, 10.5:1, and a larger turbo..maybe a straight t4.
but thanks for the help</TD></TR></TABLE>
A low rod ratio is actually good in turbo application. You could use the extra displacement too.
What were you planning to deck it or use an aftermarket crank?
there are two different cranks. one large and one small.
and the reason i'm going to use it is so i can run a long rod and actually rev it and make power, unlike 99% of ppl that build them, i'm doing it RIGHT.
so, 77mm seems to the be the limit? Guess I'll have to find out....i'm thinking about 79mm, 10.5:1, and a larger turbo..maybe a straight t4.
but thanks for the help</TD></TR></TABLE>
A low rod ratio is actually good in turbo application. You could use the extra displacement too.
What were you planning to deck it or use an aftermarket crank?
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08-25-2003, 05:41 PM
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Re: how big can you go in a SOHC? (liam821)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by liam821 »</TD></TR><TR><TD CLASS="quote">
And you can go as high as 79mm or even 80mm, but with a turbo applicaiton its not recommended for strength. The highest golden eagle recommends is 77mm in a boosted application.
If you really want power outa a d-series, use a d16, sleeve it to 77mm, 10:1 pistons, port the head like only monica lewinsky knows how, use a huge turbo and boost it to the moon.
liam</TD></TR></TABLE>
To add, 78mm is the highest Endyn recommends. That is what mine is. Sleeved by Golden Eagle
And you can go as high as 79mm or even 80mm, but with a turbo applicaiton its not recommended for strength. The highest golden eagle recommends is 77mm in a boosted application.
If you really want power outa a d-series, use a d16, sleeve it to 77mm, 10:1 pistons, port the head like only monica lewinsky knows how, use a huge turbo and boost it to the moon.
liam</TD></TR></TABLE>
To add, 78mm is the highest Endyn recommends. That is what mine is. Sleeved by Golden Eagle
08-25-2003, 05:44 PM
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Re: (GSRswapandslow)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GSRswapandslow »</TD></TR><TR><TD CLASS="quote">that's not true at all
the factory valves are so light...all you need to replace is the retainers and you're fine.
and it'll rev to maybe 9 or so</TD></TR></TABLE>
I have heard that too. I went ahead and put Ferrea stuff in though.
the factory valves are so light...all you need to replace is the retainers and you're fine.
and it'll rev to maybe 9 or so</TD></TR></TABLE>
I have heard that too. I went ahead and put Ferrea stuff in though.
08-25-2003, 06:10 PM
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Re: (GSRswapandslow)
a friend of mine has a zex powered d16t full zex cam, zex springs, zex retainers. and he revs to 9k, needless to say that he has gone through 3 heads with 2 engines. i wouldn't reccomend going to 9k on a d series, but maybe.
08-25-2003, 06:42 PM
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Re: (GSRswapandslow)
Cam profiles can also dictate how well the spring can keep up.
And RZL can back GSRswapandslow's line of **** if he can come up with the money. Time to get two jobs, Rob, and dance fatboy dance. You still owe me $65, stunna!!
And RZL can back GSRswapandslow's line of **** if he can come up with the money. Time to get two jobs, Rob, and dance fatboy dance. You still owe me $65, stunna!!
08-25-2003, 06:55 PM
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Re: (J. Davis)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by J. Davis »</TD></TR><TR><TD CLASS="quote">Cam profiles can also dictate how well the spring can keep up.
</TD></TR></TABLE>
Yes..I spun one of my NA D16Zs as high as 8800 rpms with nothing more that a gude gorilla cam....but...it didnt run any quicker than shifting it at 7500rpm and was only slightly quicker than a stock D16Z cam,like .01 improvement in ET
but it was cool reving it that high 
BTW..what's holding back Ds is its Head Flow.
</TD></TR></TABLE>
Yes..I spun one of my NA D16Zs as high as 8800 rpms with nothing more that a gude gorilla cam....but...it didnt run any quicker than shifting it at 7500rpm and was only slightly quicker than a stock D16Z cam,like .01 improvement in ET
but it was cool reving it that high BTW..what's holding back Ds is its Head Flow.
08-25-2003, 07:08 PM
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Re: (GSRswapandslow)
Your best bet might be to go with a D16A6 head,I never saw a D make more power than james wests 511whp D16A6 and also the quickest NA D was running a D16A6 Head...Bisi..that's just something to think about
Anyway..what is your goal with this motor? to be the 1st to break 9s or something?
Anyway..what is your goal with this motor? to be the 1st to break 9s or something?