how much hp before a sohc crack
03-16-2008, 12:54 AM
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how much hp before a sohc crack
Ok just wondering how much hp before a sohc block crack?? Because my crack between number 2 and 3 piston, in the middle of the block across #2 and 3?? I have a block guard on it too. setup up t3/t4 turbo, boost was 18 lbs on 91, arias piston with eagle rods, zex cam, air fuel ratio at low 12's. this is what happen push the car from 4000 rpm got to like 5500 rpm burning rubber and hit red line at 8000 rpm...**** to 3rd gear, still burning rubber it then when to 7200 rpm and boom...smoke coming out.......
this is cylinder number 2
this is cylinder number 3
Modified by charlie_sohc at 10:35 AM 3/16/2008
this is cylinder number 2
this is cylinder number 3
Modified by charlie_sohc at 10:35 AM 3/16/2008
03-16-2008, 10:00 AM
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Re: how much hp before a sohc crack (charlie_sohc)
I GUESS BOOSTING FOR OVER 2 YEAR MADE IT WEAK?? ON RACE GAS I WAS AT 27 PSI..........BUT WITH THE NEW CAM IN AT 18 PSI THAT FEEL A LOT FASTER THE 27 PSI ON RACE GAS, BECAUSE THE CAR WAS STABLE GOING STRAIGHT ANDN WITH 18 PSI I DID NOT
03-16-2008, 01:50 PM
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Re: how much hp before a sohc crack (98vtec)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec »</TD></TR><TR><TD CLASS="quote">blockguard.... 
</TD></TR></TABLE>
agreed
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by charlie_sohc »</TD></TR><TR><TD CLASS="quote">I GUESS BOOSTING FOR OVER 2 YEAR MADE IT WEAK?? ON RACE GAS I WAS AT 27 PSI..........BUT WITH THE NEW CAM IN AT 18 PSI THAT FEEL A LOT FASTER THE 27 PSI ON RACE GAS, BECAUSE THE CAR WAS STABLE GOING STRAIGHT ANDN WITH 18 PSI I DID NOT</TD></TR></TABLE>
umm whats wrong with your caps?
and if you posted a question here why are you answering it yourself?
</TD></TR></TABLE>agreed
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by charlie_sohc »</TD></TR><TR><TD CLASS="quote">I GUESS BOOSTING FOR OVER 2 YEAR MADE IT WEAK?? ON RACE GAS I WAS AT 27 PSI..........BUT WITH THE NEW CAM IN AT 18 PSI THAT FEEL A LOT FASTER THE 27 PSI ON RACE GAS, BECAUSE THE CAR WAS STABLE GOING STRAIGHT ANDN WITH 18 PSI I DID NOT</TD></TR></TABLE>
umm whats wrong with your caps?
and if you posted a question here why are you answering it yourself?
03-16-2008, 04:32 PM
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Re: how much hp before a sohc crack (98vtec)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec »</TD></TR><TR><TD CLASS="quote">blockguard.... </TD></TR></TABLE>
wow, people still use these
</TD></TR></TABLE>wow, people still use these
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03-16-2008, 08:52 PM
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Re: (K7-1Ktrevor)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by K7-1Ktrevor »</TD></TR><TR><TD CLASS="quote">new to honda stuff.
what is soo bad about a block gaurd ?
pros and cons thanks guys
</TD></TR></TABLE>
https://honda-tech.com/zerothread?id=1764067 im sure there more just do a search
what is soo bad about a block gaurd ?
pros and cons thanks guys
</TD></TR></TABLE>
https://honda-tech.com/zerothread?id=1764067 im sure there more just do a search
03-16-2008, 08:58 PM
#12
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Re: (K7-1Ktrevor)
where is likely the hottest part of the the engine cycle? right around TDC right? the exact area that the blockguard supposedly supports. does the blockguard expand at the same rate as the cylinder walls/block? So the blockguard only supports the top of the cylinder wall? what about the rest of cylinder? no support? egg shaping cylinder walls? atleast without a blockguard everything expands at the same rate....
03-16-2008, 09:00 PM
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Re: how much hp before a sohc crack (fanaticalK)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fanaticalK »</TD></TR><TR><TD CLASS="quote">the only other one ive heard of recently is a guy pushing 32 psi on a sc61 with 461whp</TD></TR></TABLE>
Jesus, that's horrible for 32psi
. He should be making that by 25psi.
Jesus, that's horrible for 32psi
. He should be making that by 25psi.
03-16-2008, 09:07 PM
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Re: how much hp before a sohc crack (98vtec)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec »</TD></TR><TR><TD CLASS="quote">psi doesnt mean ****</TD></TR></TABLE>
it does when you know the turbo size
it does when you know the turbo size
03-17-2008, 01:20 AM
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Re: how much hp before a sohc crack (98vtec)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec »</TD></TR><TR><TD CLASS="quote">psi doesnt mean ****</TD></TR></TABLE>
Lol. You can hit 450whp with an SC50 @ 25psi. Yet this guy had to rape his motor with an SC61 @ 32psi just to hit 460whp...
Lol. You can hit 450whp with an SC50 @ 25psi. Yet this guy had to rape his motor with an SC61 @ 32psi just to hit 460whp...
03-17-2008, 01:54 AM
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Re: (98vtec)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec »</TD></TR><TR><TD CLASS="quote">does the blockguard expand at the same rate as the cylinder walls/block? </TD></TR></TABLE>
Yeah. The block is aluminum, block-guards are aluminum, and the sleeve exterior is aluminum. You might argue that aluminum alloys have a slightly lower coefficient of thermal expansion than the cast aluminum block, but that only means the block-guard will expand slightly less than the sleeves...
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote »</TD></TR><TR><TD CLASS="quote">So the blockguard only supports the top of the cylinder wall? what about the rest of cylinder? no support? </TD></TR></TABLE>
Yep, the top of the cylinder - where the greatest bending moment is applied to the sleeve. That's mechanical engineering 101. As much as you might think you know from reading honda-tech all day, I assure you that the mechanical engineers who designed block-guards learned more from college...
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote »</TD></TR><TR><TD CLASS="quote">egg shaping cylinder walls? </TD></TR></TABLE>
Lol
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote »</TD></TR><TR><TD CLASS="quote"> atleast without a blockguard everything expands at the same rate....</TD></TR></TABLE>
Actually, no it doesn't. The sleeves themselves are aluminum cast around iron liners.
Don't get me wrong, I myself am a block-guard "hater", but only because I don't think they provide any benefit that outweighs the risk of failure due to installation error.
Yeah. The block is aluminum, block-guards are aluminum, and the sleeve exterior is aluminum. You might argue that aluminum alloys have a slightly lower coefficient of thermal expansion than the cast aluminum block, but that only means the block-guard will expand slightly less than the sleeves...
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote »</TD></TR><TR><TD CLASS="quote">So the blockguard only supports the top of the cylinder wall? what about the rest of cylinder? no support? </TD></TR></TABLE>
Yep, the top of the cylinder - where the greatest bending moment is applied to the sleeve. That's mechanical engineering 101. As much as you might think you know from reading honda-tech all day, I assure you that the mechanical engineers who designed block-guards learned more from college...
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote »</TD></TR><TR><TD CLASS="quote">egg shaping cylinder walls? </TD></TR></TABLE>
Lol
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote »</TD></TR><TR><TD CLASS="quote"> atleast without a blockguard everything expands at the same rate....</TD></TR></TABLE>
Actually, no it doesn't. The sleeves themselves are aluminum cast around iron liners.
Don't get me wrong, I myself am a block-guard "hater", but only because I don't think they provide any benefit that outweighs the risk of failure due to installation error.
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