i just clayed my motor today, and yeilded a paper thin clearance; you can see the "P1" stamp thru the clay, they're pretty much touching, i didnt even bother to measure the thickness of the clay
head has been resurfaced .01
CTR pistons and buddyclub P1 flat valves
oem head gasket was used for claying
obviosly in need of thicker head gasket,
any recommendations on thickness and manufacturer; what is a safe piston-valve clearance for all-motor?

 

you could grind off the the stamp that was poking through the clay

 

It would help to know what block/head/crank/rods you are using. For all we know you are using CTR pistons in your lawnmower...

 

^^^
He could be right because CTR pistons do have very high domes compared to other pistons!!

 

CTR's in B18C1, gsr crank, ITR rods
B16a head, CTR cams, stock cam gears, dual springs, titanium retainers. P1 flat valves ... using a oem 3-layer gasket for claying.
btw ... the P1 stamp is actually laser etched onto the face of the valve, so its a flush surface.

it is a high compression setup but a paper thin clearance is a lil too much on the compression side i think; i dont think they're supposed to come that close:
imagine a tooth or two off on the gears and snap crackle pop!
considering it is my first all-motor build and i am a former boost freak, i may be wrong.


Modified by vtecmonster001 at 7:35 PM 4/10/2007

 

there has to be someone that been a jam like that and knows what to do ....
obviosly a thicker gasket but how much thicker and from who?

 

WHY are you using CTR's in a GSR? Race gas cheap in your area?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtecmonster001 &raquo;</TD></TR><TR><TD CLASS="quote">CTR's in B18C1, gsr crank, ITR rods
B16a head, CTR cams, stock cam gears, dual springs, titanium retainers. P1 flat valves ... using a oem 3-layer gasket for claying.
btw ... the P1 stamp is actually laser etched onto the face of the valve, so its a flush surface.

it is a high compression setup but a paper thin clearance is a lil too much on the compression side i think; i dont think they're supposed to come that close:
imagine a tooth or two off on the gears and snap crackle pop!
considering it is my first all-motor build and i am a former boost freak, i may be wrong.


Modified by vtecmonster001 at 7:35 PM 4/10/2007</TD></TR></TABLE>

Start the car and drive it... it will be fine CTR cams are nothing compaired to what other poeple run with those pistons i've seen guys run up to .040 decked off the head with stage 2 skunk cams with no problem.... unless someone played a cruel trick on you and decked the hell out of the block.. I think the clay is playing tricks on you...

No offense but i dont know why people even use clay now how the hell are you going to measure something that is not even solid enough to hold shape to measure..

 

True story.... I use silly putty, works very nice. Doesn't stick to the head and is a little tougher than clay.

 

well said danny. CTR pistons
the other thing to do is dial out how close the piston is to the valve with gears. there really shouldnt be any problem assuming the head and block arent decked to hell.

 

FYI guys: he is talking about piston to valve clearance. NOT piston to head.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Natural Aspirations &raquo;</TD></TR><TR><TD CLASS="quote">WHY are you using CTR's in a GSR? Race gas cheap in your area?</TD></TR></TABLE>

dude, you can not say this on honda-tech. you just cant. because some tom, dick, or harry is going to come in here and tell you about his buddy's roomate's cousin's LSVTEC with CTR pistons and BC5 cams that runs on 91 octane gas with a "hella good tune dawg" and he drives it to work at the local supermarket everyday and delivers pizza with it on saturday nights.

its just inevitable.

 

block isnt decked at all, head has had .01'' resurfaced
i must be doing something wrong then ... hmmm

 

just waiting for 15sec to chime in. i think we finally got rid of his *** after flaming his *** forever.

 

I just got my b16a1 block back from the machine shop today. I got .40 (82m) 0ver Wiesco 11.5 to 1 comp ratio pistons on crower premium rods. my block is decked twice my head has been shaved 3 times and has 1mm oversized flat faced valves. The pistons stick out of the block at the edge about 1mm from what i can see. the head has been clearanced a slight bit. The machine shop said to clay it to make sure But the stock head gasket would work. but he said i might want to give up some power for safety and go with a cometic bore .82 /thickness .040 .

it scares me to think of things moving at 10000 rpm that close together. I might just pay them the few hours labor to tell me exactly the clearances. I would like to do more than guess how far i could advance the cams

whatever you decide to do post it please id be interested to know what you decided to do.

 

My advise is to check you piston to deck height, buy a gasket that will give you a minimum of .040" of clearance.

Piston to valve clearance should be at least .050"