Im getting mixed reviews on this topic... Some say go for it, some say it wont work...

Im just curious if anyone out there has run 1mm oversized valves with cams that have anywhere from 12.3 - 12.8mm lift (H22 specific)??

If so, were there any major valve to valve clearance issues?

 

I would say it depends on what pistons you are running...some aftermarket pistons have much larger valve reliefs

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by satan_srv &raquo;</TD></TR><TR><TD CLASS="quote">I would say it depends on what pistons you are running...some aftermarket pistons have much larger valve reliefs</TD></TR></TABLE>

Piston to valve clearance isnt the issue... Its valve to valve clearance that Im conserned about...

 

my friend runs rev 1mm over sized vaLVES on his full prelude

stock block, stock cams fully built head dynoed 228 on shawn church dyno

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TYPERman2001 &raquo;</TD></TR><TR><TD CLASS="quote">my friend runs rev 1mm over sized vaLVES on his full prelude

stock block, stock cams fully built head dynoed 228 on shawn church dyno </TD></TR></TABLE>

yeah, I know you can run 1mm oversized valves with stock cams... I was just curious if anyone had any experience running them with an aftermarket cam, something with some decent lift (12.3'ish)

The issue in question is valve to valve clearance...

 

we check valve cleareance with jun cams and it was prettty close so we decided to run stock cams to be on safe side

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TYPERman2001 &raquo;</TD></TR><TR><TD CLASS="quote">we check valve cleareance with jun cams and it was prettty close so we decided to run stock cams to be on safe side </TD></TR></TABLE>

What was the v to v clearance at with the JUN cams?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TYPERman2001 &raquo;</TD></TR><TR><TD CLASS="quote">we check valve cleareance with jun cams and it was prettty close so we decided to run stock cams to be on safe side </TD></TR></TABLE>

So you chose to run oversize valves instead of bigger cams?!

 

for the time being yeah cause the head was designed for oversized valves

got a new head and going full jun valve train with my jun cams

and got my rs machine motor back 90 mill 14++ compression shopuld be a fun motor

 

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

yeah, I know you can run 1mm oversized valves with stock cams... I was just curious if anyone had any experience running them with an aftermarket cam, something with some decent lift (12.3'ish)

The issue in question is valve to valve clearance...</TD></TR></TABLE>

Look in TBone's All-Motor build thread, he ran into problems with v-v clearance on Jun4's or something insane. But I don't know the lift specs, or if his valves were oversized (I'm guessing they were since every inch of that motor was built hard-core).