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Author Topic:   Jeff needs help.....LOL
awkwardjeff
Dirt Forum Champ
Total posts: 562
posted March 17, 2005 08:50 AM  
Okay,
Over the years I have helped many people on this site, and recieved many private messages thanking me.....

Here is what I need help with.... we are putting together a B-mod for our pit crew to race on off days.... 9.5 compression rule, with a hyd. cam..... engine is a 355, 487 heads with a stock intake of some type yet to be determined.....

I need help with cam selection, and valve lash setting..... How do you guys set the valve lash with a hyd. cam?????

I know the knowledge will be shared, because this is a great site and people help each other here...... Thanks in advance for everyone input.

Jeff

justin
Dirt Freak

Total posts: 263
posted March 17, 2005 04:04 PM  
I don't think you have to set the lash on a hydraulic cam. Is there a lift rule for the cam?

Justin

I-B-RACIN
Dirt Maniac

Total posts: 132
posted March 17, 2005 04:31 PM  
With stock hyd. they actually call for 1 turn down from zero but I like to run like a half turn but with the anti pump up hyd. they call for a lash of zero because they act more like a solid. Is this going in a wissota b mod?

midmod34
Dirt Maniac

Total posts: 119
posted March 17, 2005 05:42 PM  
set them at .002"

awkwardjeff
Dirt Forum Champ
Total posts: 562
posted March 17, 2005 11:09 PM  
Yes this will be a wissota B-mod, Superior is running them every other week, then running the pure stocks every other week.... we will run our old car in the B-mod class to help the car count and let the guys have some fun.

So what you people are saying on lash setting just set them as a normal solid but set the lash at .002 on the loose side to a 1/2 turn down on the tight side.....

I-B-RACIN if you don't care to p[ost a cam selections here I understand.... you can PM the information to me.....

quote:
Originally posted by I-B-RACIN
:IMG]http://www.thedirtforum.com/ubb/smilies/cwm1.gif[/IMG] [IMG]

With stock hyd. they actually call for 1 turn down from zero but I like to run like a half turn but with the anti pump up hyd. they call for a lash of zero because they act more like a solid. Is this going in a wissota b mod?


[IMG]

FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted March 18, 2005 01:21 AM  
I always set the lash the old fashioned way. With the engine not running spin the push rods and tighten the rockers until you feel a bit of resistance then start the engine and back off each rocker until it clicks then SLOWLY tighten then back. When the rocker quits ticking tighten another half or one full turn (your preference I go 1 full). Thats the way I always done them.

Hope that helps!

A&M Motorsports
Dirt Maniac

Total posts: 117
posted March 18, 2005 05:34 AM  
Jeff, I agree with flynlo. Adjust them to where you can just spin the pushrod. They make little clips that you can put on the end of the rocker on the pushrod side to stop the oil from getting on the ceiling so you can make the final adjustments with the engine running. Or cut the top out of an old valve cover, this works well also.
If there is a vacuum rule, run the rhoads anti pupmp up lifters.
Rhoads says DO NOT SOAK NORMAL HYDRAULIC LIFTERS IN OIL PRIOR TO INSTALLING THEM IN THE LIFTER BORES?????????????

------------------
Artie Perilloux
A & M Motorsports

dirtdoc
Dirt Roller

Total posts: 8
posted March 18, 2005 06:59 AM  
Jeff if you need info on cam or cam lash or even what cam and lifters you need to run you can call CRANE, lunati, cams and ask to talk to the tech dept. and they will give you all the advise you need . good luck !!!

vince88
Dirt Full Roller

Total posts: 43
posted March 18, 2005 07:20 AM  
Do you have a lift rule? if so Howard cams have some good lift rule cams. on my engine i spin the push rod until rocker at zero and make 3/4 turn. i know guys that run ash on hyd. cam but they are running launcher camshafts really hard on valve train though. but make ya car fast.

awkwardjeff
Dirt Forum Champ
Total posts: 562
posted March 18, 2005 08:03 AM  
There are no rules about lift or vacume.... so I assume anything hyd is legal.... no rollers....

I haven't set the lash on a hyd. cam since we rebuilt the engine in the motor home 10 years ago...... And if I remember correctly they were too tight hanging a couple valves open. I didn't set them to start the motor someone else did.... But I was elected to FIX the problem of this new motor not running good.....LOL

I think I can handle the lash setting from other peoples advice...... And before i'm done I will probably end up calling a cam builder to get input on cam selection. I wanted some ball park figures.....

Thanks for the input men, I would still welcome some cam selection numbers.

11mt40
Dirt Full Roller

Total posts: 53
posted March 18, 2005 08:30 AM  
We also are running a B-mod and our cam selection is still up in the air so if anyone would like to PM me some cam numbers it would be helpful. Thanks in advance!!

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted March 18, 2005 11:07 AM  
I would run the antipump up lifters and set the vavles at 0 lash and leave them. Just run them down until you feel slight resistance spinning them, you know when all celarance is just gone and leave them or maybe give jsut an 1/8 turn or so. Those lifters are made to run that way and they will act more like a solid lifter, and wont pump up at high rpms.

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted March 18, 2005 11:15 AM  
I have used some of comps Xtreme line in street cars that seemed to work pretty good. They are pretty aggresive for hyd cams. They are all ground on 110 lobe center though, but you could have a custom ground 106 if you wanted.

dirtywrench13
Dirt Freak

Total posts: 324
posted March 19, 2005 07:12 AM  
i've worked for many years as an auto technician,so heres my nickles worth.i'd just lube the lifterswith oil and stuff them in. tighten the rocker nut to where the pushrod just won't spin, then start it and let it warm up.with it idleing loosen one rocker at a time till its noisy, then back to just shut it up, then go another 1/4 to 1/2 turn. then move on to the next one.

Scottavery
Dirt Roller

Total posts: 18
posted March 19, 2005 07:40 AM  
years ago when I ran a hyd cam, I would set the valve with engine running and adjust down till the tick went away and this will give you almost the same effect as a solid lifter. The plunger will be all the way up

orange2mod
Dirt Maniac

Total posts: 113
posted March 19, 2005 09:20 AM  
Here is a cam I have ran for years on a paperclip 1/4 mile with a small motor and it pulls real hard. Summit # sum-1107. #'s are 292-302. 488-510. Just get the anti pump lifters. The cam costs 59.95. Hope this helps.

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