|
Re: adjustable pushrods- a good idea or not?
[Re: ahy]
#973432
04/15/11 04:03 AM
04/15/11 04:03 AM
|
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
|
Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
|
Quote:
A good idea except you need only one adjustable PR. Use it to get the correct length and order a set of custom solid pushrods. Your local circle track (Chevy?) engine builder can order them, Smith Brothers can make them and Hughes can make them. Not a big expense and worth it.
I never seen them used in a motor, use one to determine the correct lenght and have 16 made, no big deal.
|
|
|
Re: adjustable pushrods- a good idea or not?
[Re: Mike H]
#973434
04/15/11 08:29 AM
04/15/11 08:29 AM
|
Joined: Jan 2003
Posts: 75,043
U.S.S.A.
JohnRR
I Win
|
I Win
Joined: Jan 2003
Posts: 75,043
U.S.S.A.
|
Quote:
Due to head/block milling on my 383 (hydraulic lifters, stock mopar rockers) I need to either go with adjustable rockers (big $), shim the rocker arms up, or go with adjustable pushrods.
The guy who built the engine doesn't feel good about adj pushrods, even though is is a pretty mild (350 hp) motor that I baby. Anyone running adj pushrods? Had any problems? Are they a no-no? If they are ok, whose would you recommend?
One of your choices is NOT a choice unless you ALSO have a rocker arm to valve tip geometry problem that needs to be corrected.
So your only other choices are adjustable rockers or adjustable pushrods and good adjustable pushrods are not real cheap. I just set up a 440 wit ha hyd. cam , new MP stamped steel rockers and adjustable pushrods , for the ultimate end cost it would have been more cost effective to just get a good set of adjustable rockers. That said there is nothing wrong with them , they are just tedious to initially setup .
|
|
|
Re: adjustable pushrods- a good idea or not?
[Re: ahy]
#973437
04/15/11 01:20 PM
04/15/11 01:20 PM
|
Joined: Dec 2007
Posts: 18,157
Mass
DAYCLONA
I Live Here
|
I Live Here
Joined: Dec 2007
Posts: 18,157
Mass
|
Quote:
A good idea except you need only one adjustable PR. Use it to get the correct length and order a set of custom solid pushrods. Your local circle track (Chevy?) engine builder can order them, Smith Brothers can make them and Hughes can make them. Not a big expense and worth it.
....best advice, I had an adjustable pushrod decide to "let go" in motor at high rpm years ago, what a mess,....you can also buy DIY pushrod sets to make your own, should you want to tackle it on your own 
|
|
|
Re: adjustable pushrods- a good idea or not?
[Re: DAYCLONA]
#973438
04/15/11 01:26 PM
04/15/11 01:26 PM
|
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
|
Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
|
Quote:
Quote:
A good idea except you need only one adjustable PR. Use it to get the correct length and order a set of custom solid pushrods. Your local circle track (Chevy?) engine builder can order them, Smith Brothers can make them and Hughes can make them. Not a big expense and worth it.
....best advice, I had an adjustable pushrod decide to "let go" in motor at high rpm years ago, what a mess,....you can also buy DIY pushrod sets to make your own, should you want to tackle it on your own
Like I said above, I've never seen adj PR used in a running motor, but I do lead a pretty sheltered life.
I would never even consider using them myself.
|
|
|
Re: adjustable pushrods- a good idea or not?
[Re: Mike H]
#973439
04/15/11 02:04 PM
04/15/11 02:04 PM
|
Joined: Jul 2008
Posts: 394
md
wicked
enthusiast
|
enthusiast
Joined: Jul 2008
Posts: 394
md
|
I had ordered a stock replacement cro-mo type set custom length from Summit a few years ago, Think they ended up coming from Comp Cams or Crane and wasn't crazy money.
Last edited by wicked; 04/15/11 02:09 PM.
|
|
|
Re: adjustable pushrods- a good idea or not?
[Re: Mike H]
#973440
04/15/11 03:49 PM
04/15/11 03:49 PM
|
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
Dodgem
master
|
master
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
|
I used them for years on my 440 and they are still on my buddies 440. best way to set them is on the engine stand with the intake off. second is n car intake off. I set them so they lightly ticked as I did a lot of racing. But they are not cheap. http://www.summitracing.com/parts/CRO-70009-16/well it was the way to go back in the day or the way I went dam in the eighties I paid 10 11 dollars each for MP ones. still $160 verse buying rockers and pushrods is still less?? I don't see any for a 383 /400 so you would have to contact crower MP has not listed them for years. 
Last edited by Dodgem; 04/15/11 03:59 PM.
|
|
|
Re: adjustable pushrods- a good idea or not?
[Re: Dodgem]
#973446
04/15/11 05:29 PM
04/15/11 05:29 PM
|
Joined: Jan 2003
Posts: 75,043
U.S.S.A.
JohnRR
I Win
|
I Win
Joined: Jan 2003
Posts: 75,043
U.S.S.A.
|
Quote:
But they will work on a mild iron head motor to reduce preload. Old method before your time.
I don't care if it is old backyard hack way to fix for over aggressive head milling or if someone did it 10 years ago and has 4 million miles since without an issue, the only reason to move the rocker shaft is to CORRECT rocker to valve geometry.
|
|
|
Re: adjustable pushrods- a good idea or not?
[Re: JohnRR]
#973447
04/15/11 09:24 PM
04/15/11 09:24 PM
|
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
Dodgem
master
|
master
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
|
Quote:
Quote:
But they will work on a mild iron head motor to reduce preload. Old method before your time.
I don't care if it is old backyard hack way to fix for over aggressive head milling or if someone did it 10 years ago and has 4 million miles since without an issue, the only reason to move the rocker shaft is to CORRECT rocker to valve geometry.
If you read what hughes says
"Priced Each/ Usually Sold In Sets Of 10. Use to adjust rocker shaft height for achieving proper valve train geometry and pushrod length."
and pushrod length so in many cases milling the heads with stock rockers and pushrods makes the pushrods to long and these shims can be used to fix that!!!
I am right and rest my case!!
|
|
|
|
|
