Posted By: emarine01
Valve lash how tight? - 02/18/09 02:01 PM
On a solid roller that specs out for lash @ .020I & .022e hot , how much tighter can you safley go?
Valve lash how tight?
Posted By: BobR
Re: Valve lash how tight? - 02/18/09 02:10 PM
I've run .010/.012 with no problems. It will change the cam performance slightly.
Posted By: Anonymous
Re: Valve lash how tight? - 02/18/09 03:04 PM
With aluminum heads the lash will always change so check it HOT and too tight can and will slow you down--you have to have enough room for it to shut that valve at high RPM---I sent one out ran 5.60 all day long--next week started 5.90--still ran fine but where did all that ET go? Come to find out the customer had the valves too tight--more lash and back to 5.60 again 
Posted By: emarine01
Re: Valve lash how tight? - 02/18/09 03:10 PM
I was thinking cuting back .010 on both ,trying to cheet on a small cam a bit
Posted By: Cab_Burge
Re: Valve lash how tight? - 02/18/09 05:26 PM
The tight lash cams can not be ran as tight as the loose lash cams can, I wouldn't start with ten thousands on your cam as it is in the middle of being a tight or loose lash cam. I would try .004 to .007 and see what the motor does and then try a little tighter if the motor repsonds to the tighter lash
Posted By: AndyF
Re: Valve lash how tight? - 02/18/09 05:47 PM
The cam designer specified that lash for a reason. I wouldn't change it.
Posted By: emarine01
Re: Valve lash how tight? - 02/18/09 06:15 PM
Just got off the phone with comp cams , tightest lash .010/.012 hot , so looks like .010 is the ticket 
Will make cam seem 2 to 3 degrees larger
Will make cam seem 2 to 3 degrees larger
Posted By: BobR
Re: Valve lash how tight? - 02/18/09 06:32 PM
Quote:
Just got off the phone with comp cams , tightest lash .010/.012 hot , so looks like .010 is the ticket
Why that sounds familiar. And IMo there is nothing wrong with experimenting with lash. I've done it successfully several times over the years.
Posted By: Rapid340
Re: Valve lash how tight? - 02/18/09 06:44 PM
That is one of the nice things with a solid, you can adjust lash on intake and exhaust independantly and experiment.
BTW, be carefull on opening up lash too much, I would limit it to four or five thousanths more than the recomended lash.
BTW, be carefull on opening up lash too much, I would limit it to four or five thousanths more than the recomended lash.
Posted By: emarine01
Re: Valve lash how tight? - 02/18/09 06:54 PM
I learned that on the hard way, I think I beat the lash caps in on 3 valves when we were opening up lash on a 280/284 @ .050 cam 
Posted By: BobR
Re: Valve lash how tight? - 02/18/09 08:41 PM
One more thing to watch for is a piston/valve clearance change. If you are already close this is much more of an issue.
Posted By: Mr.Yuck
Re: Valve lash how tight? - 02/18/09 10:00 PM
wow I just did my 528 solid w/ 1.5 rollers at .026/.030...maybe I should go re-do them
Posted By: Anonymous
Re: Valve lash how tight? - 02/18/09 11:21 PM
It was suggested to me to run about 6 to 8 thous. tighter with aluminum heads. I have a MP 590 cam, and is suppose to be 28-32 and I run them at 20-24 and it seems to run fine. I checked them several times and they stayed right on the numbers. Some racers ran them much tighter than that and said the car went faster. I'm just not williing to take that much of a chance. With indy heads cut down to 69 cc and a 0 decked block they had enough clearance at were I set them.
Posted By: Thumperdart
Re: Valve lash how tight? - 02/19/09 12:15 AM
I have an isky solid roller w/.680-.660 lift and 275-280 dur@ .050 and the cam card calls for .026 hot in. and ex. I`ve set em that loose and can`t stand the rattle and it sounds like it`s coming apart so now I set em at .014(cold) and they end up at around .019-.020(hot) and runs the best so far.