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b20/vtec piston myth!!!!!!

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Old 03-05-2008 | 03:49 PM
  #51  
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Default Re: b20/vtec piston myth!!!!!! (bambam)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bambam &raquo;</TD></TR><TR><TD CLASS="quote">I'll take that 100.00. Common sense says that if the valves WERE contacting the pistons, then they would get damaged/bent and the car wouldn't run at all because it would not be able to maintain compression.
I don't disagree with the fact that it shouldn't be done, but you're statement is just plain dumb.</TD></TR></TABLE>YEAH YEAH MISTER KNOW IT ALL WHAT EVER YOU SAY I HAVE SEEN IT AND I KNOW FOR A FACT IT WILL HAPPEN
Old 03-05-2008 | 03:50 PM
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Default Re: b20/vtec piston myth!!!!!! (allmotorB18eg)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by allmotorB18eg &raquo;</TD></TR><TR><TD CLASS="quote">YEAH YEAH MISTER KNOW IT ALL WHAT EVER YOU SAY I HAVE SEEN IT AND I KNOW FOR A FACT IT WILL HAPPEN </TD></TR></TABLE>

Ever clay this setup? There's clearance. Numbers don't lie.
Old 03-06-2008 | 12:37 PM
  #53  
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Default Re: b20/vtec piston myth!!!!!! (bambam)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bambam &raquo;</TD></TR><TR><TD CLASS="quote">Ever clay this setup? There's clearance. Numbers don't lie.</TD></TR></TABLE> yes i have and at high rpm they tap every time. every time someone tells me they will not i bet them after a monh to pull there head off and bam i win that bet don't really care what your books say i know what i have seen time and time again 1st hand
Old 03-06-2008 | 12:45 PM
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Default Re: b20/vtec piston myth!!!!!! (allmotorB18eg)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by allmotorB18eg &raquo;</TD></TR><TR><TD CLASS="quote"> yes i have and at high rpm they tap every time. every time someone tells me they will not i bet them after a monh to pull there head off and bam i win that bet don't really care what your books say i know what i have seen time and time again 1st hand </TD></TR></TABLE>

I'm not discrediting your statement. But a 100% stock block, stock head, lsvtec with B16 or GSR cams, no cam gear adjustments, stock headgasket, no milling, and RPM's kept within reasonable limits (8k), and no combustion build-up on the pistons or valves, will not have contact. Even given the expansion rate of the valves and pistons under heat, it would still not hit. Like I said, I believe you. But with what I said above, they won't contact each other...although it would be really close. Maybe you're findings were due to valve float at higher RPM...I don't know...it's nearly impossible to prove.
Old 03-06-2008 | 01:37 PM
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Default Re: b20/vtec piston myth!!!!!! (bambam)

megh.

either way, rs pistons are cheap IMO.
it's wise to swap out the stockers in favor of some RS pistons and new rings and rehone AT THE LEAST.
i guess if you're cheap or ghetto and don't mind risking stuff breaking, just slap the vtec head on and run it. or if you don't mind having a less capable setup.

to each their own.


..megh.
Old 03-06-2008 | 01:42 PM
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Default Re: b20/vtec piston myth!!!!!! (ipodhustle)

I agree totally. I never recommended running the LS pistons. RS is where it's at.
Old 03-07-2008 | 06:47 PM
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I used b20B piston with ctr cams +stock cam gear , no milling on head and no resurfacing on the block. The valve had contact with the piston even when i set my rev limit to 6800rpm. Then i changed out to RS pistons and it was rev happy to 8300rpm.

Do it right the first time..
Old 03-07-2008 | 10:47 PM
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There is also a myth that any piston to valve contact will cause catastrophic engine failure.
Old 03-08-2008 | 08:32 AM
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<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Combustion Contraption &raquo;</TD></TR><TR><TD CLASS="quote">There is also a myth that any piston to valve contact will cause catastrophic engine failure.</TD></TR></TABLE>

You may be right. I've had to deal with the issue but only once, and that was the result of rod bolt failure. Even so, piston to valve contact was very minimal and you could only tell visually on the piston that anything had happened.
Old 03-08-2008 | 08:55 AM
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<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by This Scene Sucks &raquo;</TD></TR><TR><TD CLASS="quote">i still say the best way to build a b20 block is an 81mm p30 and 3mm of jb weld.</TD></TR></TABLE>

It would be 1.5mm all the way around.
Old 03-09-2008 | 02:33 PM
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Default Re: b20/vtec piston myth!!!!!! (bentegrity)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bentegrity &raquo;</TD></TR><TR><TD CLASS="quote">

well, my bad i guess to me (at least) it seemed that this thread sorta kinda drifted OT from p2v clearence anyway, so i figured i'd just ask if it would prolong the life of the bottom end.

i'm putting a b16a2 head on a b20, ctr cams, omnipower VT, and really don't plan on revving past 8k-8.5k (8.5k being the absolute max). i wasn't planning on upgrading pistons until i've gone over this thread. i figured that a block guard would pretty much help, but am hesistating, due to the fact that i've heard many poor things about the stock pistons/sleeves.

so it'd be cool if i could get my question asked properly now i guess will a block guard be effective in aiding my pistons, or will revving as high as i want to rev make it necessary to upgrade? </TD></TR></TABLE>

Old 03-10-2008 | 02:07 AM
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Im not sure how many of you actually have first hand experience with B20piston vtec. But this is my experience:



That is my B20b piston after being daily-ed for almost two years. Was never babied. It has seen 9K RPM several times. Ran strong til the day it was torn down. I did regular compression checks.

^Notched B20b pistons, S2S2, P2V measured during build up, Tuned.

Yes all 4 pistons had the same hits/marks on the same side (intake). All valves are in good condition - no nicks/bends.

Leaving it up to you so you can make your own conclusion


Modified by EG6R at 7:34 AM 3/10/2008
Old 03-10-2008 | 10:41 AM
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Default Re: b20/vtec piston myth!!!!!! (GOLDBERG)

i have a b20 vtec. every internal is stock, didnt have to change a thing, im about 50k miles in and its still running strong.
Old 03-10-2008 | 01:32 PM
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Default Re: (EG6R)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EG6R &raquo;</TD></TR><TR><TD CLASS="quote">Im not sure how many of you actually have first hand experience with B20piston vtec. But this is my experience:



That is my B20b piston after being daily-ed for almost two years. Was never babied. It has seen 9K RPM several times. Ran strong til the day it was torn down. I did regular compression checks.

^Notched B20b pistons, S2S2, P2V measured during build up, Tuned.

Yes all 4 pistons had the same hits/marks on the same side (intake). All valves are in good condition - no nicks/bends.

Leaving it up to you so you can make your own conclusion


Modified by EG6R at 7:34 AM 3/10/2008</TD></TR></TABLE>
happens every time bam bam will argue with it but if you use stock pistons this will happen unless you don't plan on going to 8k and if not why bother whats the point of a vtec motor if not taking it at least to 8k rs pistons is the way to go if your not sleeving and building it
Old 03-11-2008 | 04:31 PM
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Of course I'll argue it....because he was running S2S2's on stock pistons at 9k....tsk tsk. I don't care dude...I'm exhausted on this point. I haven't witnessed it myself. The point I was trying to prove was RPM's, in regards to valve float. You said it will happen every time...well I can certainly attest that it won't. It's a dumb argument anyways...it's stupid to run that low of compression in these motors (LS/B20 pistons). At least we can both agree to be running RS pistons.
Old 04-19-2008 | 08:37 AM
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Default Re: (IMPORT JEDI)

I am running a b20b with a 00 GSR head 3 angle valve job with Type R cams and I was looking to get some more top end. I can get to 120 in fourth alright then its just laggy compared to my b16 that I had before...
Old 04-19-2008 | 09:30 PM
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Default Re: (GottaB20man)

Does anyone know page that lists the mods needed to make a B20 piston work?

There used to be an Omniman thread or page but after searching I can't find it.

He listed how much he shaved the block to get high compression and angles and diameters of the piston reliefs.

Has anyone heard of using old 1986-1987 Legend pistons in a B20? They were 84mm and are supposed to raise compression.
Old 01-25-2010 | 04:47 AM
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Default Re: b20/vtec piston myth!!!!!!

brought back from the dead
Old 01-25-2010 | 03:07 PM
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Default Re: b20/vtec piston myth!!!!!!

Theres actually alot of questions that still get asked to today in this thread, good find.
Old 01-25-2010 | 03:59 PM
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Default Re: b20/vtec piston myth!!!!!!

i used itr spec pictons... and never had to mod the head.. good luck
Old 01-25-2010 | 04:45 PM
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Default Re: b20/vtec piston myth!!!!!!

see,i want to use a stock gsr head and stock block.im only reving to 8k...what do you guys think
Old 01-25-2010 | 04:48 PM
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Default Re: b20/vtec piston myth!!!!!!

dont rev to 8 k and dont use a stock block... because when u spin bearings ur going to mess up ur crank.. save ur money and do it right.. or dont do it at all and donate ur parts to me... hahahah didnt notice how old this was.. gotta keep ur eyes peeled for the date
Old 01-29-2010 | 02:48 PM
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Default Re: b20/vtec piston myth!!!!!!

What?
Old 01-03-2011 | 07:39 AM
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Default Re: b20/vtec piston myth!!!!!!

So whats the deal in doing a b20/vtec? So your saying if you dont go force induction, if you install vtec you got to change your pistons?(humm)
Old 01-03-2011 | 03:36 PM
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Default Re: b20/vtec piston myth!!!!!!

Originally Posted by 3rd generation honda
So whats the deal in doing a b20/vtec? So your saying if you dont go force induction, if you install vtec you got to change your pistons?(humm)
WOW you just bumped a thread that hasnt been touched for a year and was started back in 05. It is a pretty common thing for people to swap out stock B20 pistons for pistons out of a vtec motor when building a B20V. This is pretty much required for anything running larger then OEM cams. It allows for better P2V clearances and also gives better compression and more power. Stock slugs CAN be run, I have seen it done (B16 and GSR cams only),but I always error on the side of safe and make my clearances safe.


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