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Piston to valve clearence checking ? #261283
03/21/09 10:54 PM 03/21/09 10:54 PM
Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
Hemi Allstate Offline OP
master
Hemi Allstate  Offline OP
master

Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.

How much clearence should I have doing the 10* BTDC to 10* ATDC check?
I have checked by using zero lash ( lash is .018") and then added .100" at the retainer and had no interference. Is this sufficient, or should I make additonal checks?

I also checked at max lift and I can push the rocker on further to bottom on the seal never hitting the piston.

Mark


1996 Ram 1500 Sport
1968 road runner
1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
Re: Piston to valve clearence checking ? [Re: Hemi Allstate] #261284
03/21/09 10:58 PM 03/21/09 10:58 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
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Posts: 52,972
Romeo MI
I like to clay them also but the .100 is enough if
you checked it every degree from about 15 before to
15 after just to make sure
Re: Piston to valve clearence checking ? [Re: MR_P_BODY] #261285
03/21/09 11:05 PM 03/21/09 11:05 PM
Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
Hemi Allstate Offline OP
master
Hemi Allstate  Offline OP
master

Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.

I pre loaded the rocker .100" and rotated the crank. I never had inteference.
Should I check BTDC & ATDC as well?
I usually use clay too but I was trying to measure this one.

Thanks,
Mark


1996 Ram 1500 Sport
1968 road runner
1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
Re: Piston to valve clearence checking ? [Re: Hemi Allstate] #261286
03/21/09 11:14 PM 03/21/09 11:14 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
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Joined: Jun 2003
Posts: 52,972
Romeo MI
Well if you want to measure it, start at 15 before
and press the valve down till it hits and take your
reading(on your dial indicator) every degree to 15 after
then you will know if you can move the degreed centerline
for future reasons
Re: Piston to valve clearence checking ? [Re: MR_P_BODY] #261287
03/21/09 11:22 PM 03/21/09 11:22 PM
Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
Hemi Allstate Offline OP
master
Hemi Allstate  Offline OP
master

Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.

What would be acceptable numbers in that range? Should I be able to read max lift or some thing less?
Is this BTDC on compression stroke ?
I appreciate your help.

Thanks,
Mark


1996 Ram 1500 Sport
1968 road runner
1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
Re: Piston to valve clearence checking ? [Re: Hemi Allstate] #261288
03/21/09 11:30 PM 03/21/09 11:30 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
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Posts: 52,972
Romeo MI
Quote:


What would be acceptable numbers in that range? Should I be able to read max lift or some thing less?
Is this BTDC on compression stroke ?
I appreciate your help.

Thanks,
Mark



With 0 lash, start at 15 before, 0 the indicator then
press the valve till it touches write down that number,
continue doing it till 15 after... the same way, zeroing
each time before you press it down, this will give
you your max at each degree... in case you want to
advance the cam in the future(or retard it) .100 is fine
Re: Piston to valve clearence checking ? [Re: MR_P_BODY] #261289
03/21/09 11:46 PM 03/21/09 11:46 PM
Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
Hemi Allstate Offline OP
master
Hemi Allstate  Offline OP
master

Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
Quote:

Quote:


What would be acceptable numbers in that range? Should I be able to read max lift or some thing less?
Is this BTDC on compression stroke ?
I appreciate your help.

Thanks,
Mark



With 0 lash, start at 15 before, 0 the indicator then
press the valve till it touches write down that number,
continue doing it till 15 after... the same way, zeroing
each time before you press it down, this will give
you your max at each degree... in case you want to
advance the cam in the future(or retard it) .100 is fine




Sorry to ask so many questions, I just wanted to be clear on this. I made a few checks starting at 10* before and was getting .250" minimum, but wasn't sure if that was OK. I will recheck starting at 15 BTDC.
Thank you again,
Mark


1996 Ram 1500 Sport
1968 road runner
1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
Re: Piston to valve clearence checking ? [Re: Hemi Allstate] #261290
03/22/09 12:00 AM 03/22/09 12:00 AM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
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Posts: 52,972
Romeo MI
Sounds like you have a ton of room, I said 15 only
because about 10 degrees is usually the close spot
but not always. The reason I say to get a real number is
you dont know what you have if you put a .100 spacer
in it, thats one of the reasons I like to clay but
also get a number at each degree for advance or retard
purposes

Re: Piston to valve clearence checking ? [Re: MR_P_BODY] #261291
03/22/09 12:02 AM 03/22/09 12:02 AM
Joined: Oct 2004
Posts: 3,097
back in Georgia
dthemi Offline
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dthemi  Offline
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back in Georgia
Like P said 10 before will be closest on the ex and 10 after will be closest on the intake.

Nice looking mill too!
Re: Piston to valve clearence checking ? [Re: dthemi] #261292
03/22/09 12:08 AM 03/22/09 12:08 AM
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
S
Sport440 Offline
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Sport440  Offline
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S

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Canton, Ohio
Quote:

Like P said 10 before will be closest on the ex and 10 after will be closest on the intake.

Nice looking mill too!





Re: Piston to valve clearence checking ? [Re: MR_P_BODY] #261293
03/22/09 12:23 AM 03/22/09 12:23 AM
Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
Hemi Allstate Offline OP
master
Hemi Allstate  Offline OP
master

Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
Quote:

Sounds like you have a ton of room, I said 15 only
because about 10 degrees is usually the close spot
but not always. The reason I say to get a real number is
you dont know what you have if you put a .100 spacer
in it, thats one of the reasons I like to clay but
also get a number at each degree for advance or retard
purposes




Great! I think I can wrap this up and have some notes for future reference!
BTW I used the adjuster for the preload and not a spacer, if that matters?
Thanks,
Mark


1996 Ram 1500 Sport
1968 road runner
1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
Re: Piston to valve clearence checking ? [Re: dthemi] #261294
03/22/09 12:26 AM 03/22/09 12:26 AM
Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
Hemi Allstate Offline OP
master
Hemi Allstate  Offline OP
master

Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
Quote:

Like P said 10 before will be closest on the ex and 10 after will be closest on the intake.

Nice looking mill too!



Thanks for your input and kind words dt.

Mark


1996 Ram 1500 Sport
1968 road runner
1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
Re: Piston to valve clearence checking ? [Re: Sport440] #261295
03/22/09 12:34 AM 03/22/09 12:34 AM
Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
Hemi Allstate Offline OP
master
Hemi Allstate  Offline OP
master

Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
Quote:

Quote:

Like P said 10 before will be closest on the ex and 10 after will be closest on the intake.

Nice looking mill too!








Thanks Mike!

Moparts comes through again!

Mark


1996 Ram 1500 Sport
1968 road runner
1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
Re: Piston to valve clearence checking ? [Re: Hemi Allstate] #261296
03/22/09 12:41 AM 03/22/09 12:41 AM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

Joined: Jun 2003
Posts: 52,972
Romeo MI
Quote:

Quote:

Quote:

Like P said 10 before will be closest on the ex and 10 after will be closest on the intake.

Nice looking mill too!








Thanks Mike!

Moparts comes through again!

Mark



My pleasure.... good lookin engine ya got there

Re: Piston to valve clearence checking ? [Re: MR_P_BODY] #261297
03/22/09 08:49 AM 03/22/09 08:49 AM
Joined: Dec 2008
Posts: 1,200
UK
6
602heavy Offline
pro stock
602heavy  Offline
pro stock
6

Joined: Dec 2008
Posts: 1,200
UK
Nice motor.

Piston is always chasin the valve , critical points to check are 15* before & after TDC , @ full lift the piston is too far down the hole , unless the valve events are all messed up.


Re: Piston to valve clearence checking ? [Re: 602heavy] #261298
03/22/09 01:43 PM 03/22/09 01:43 PM
Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
Hemi Allstate Offline OP
master
Hemi Allstate  Offline OP
master

Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.

Thanks to all for the help, and kind words.

Mark


1996 Ram 1500 Sport
1968 road runner
1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
Re: Piston to valve clearence checking ? [Re: Hemi Allstate] #261299
03/22/09 01:52 PM 03/22/09 01:52 PM
Joined: Oct 2004
Posts: 3,097
back in Georgia
dthemi Offline
master
dthemi  Offline
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Joined: Oct 2004
Posts: 3,097
back in Georgia
It would be good to carefully measure and record how much clearance you have, so when you think about another cam you'll know how big you can go later.

Re: Piston to valve clearence checking ? [Re: dthemi] #261300
03/22/09 04:00 PM 03/22/09 04:00 PM
Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
Hemi Allstate Offline OP
master
Hemi Allstate  Offline OP
master

Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
Quote:

It would be good to carefully measure and record how much clearance you have, so when you think about another cam you'll know how big you can go later.



Thanks Darren ,
I will do that. I already have a file going on this engine build, I need to include these measurements as well. I can see a bigger cam in the future.

Mark


1996 Ram 1500 Sport
1968 road runner
1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019

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