Manton trunnion upgrade.
Thread Starter
Melting Slicks
Joined: Aug 2004
Posts: 2,893
Likes: 222
From: Oakbank Manitoba
Manton trunnion upgrade.
I thought I'd share a few pictures of the Manton style of trunnion upgrade. These are a bushing style of trunnion upgrade. The shafts are tool steel. The bushings have a lip on the outside. A shim is then spaced between the bushing lip and the C clip.
These are almost twice the price of the Straub bushing upgrade ($310). I like the fact they are tool steel and have the lip and shim. The trunnion shaft is also slightly larger with a thinner bushing.
These are almost twice the price of the Straub bushing upgrade ($310). I like the fact they are tool steel and have the lip and shim. The trunnion shaft is also slightly larger with a thinner bushing.
Last edited by KENS80V; Mar 30, 2018 at 10:51 PM.
Team Owner
Joined: Nov 2007
Posts: 24,035
Likes: 2,340
From: Gilbert AZ
Great upgrade. I did the smith bros and so far so good.
Would not run any of the commonly available "roller tip" options. Downsides are too great when these work wonderfully and perform better.
Would not run any of the commonly available "roller tip" options. Downsides are too great when these work wonderfully and perform better.
Le Mans Master
Joined: Apr 2011
Posts: 7,820
Likes: 408
From: Montreal
St. Jude Donor '13
Have nothing against stock with upgrades, but roller tips work great if set up properly. Using the same ones for 4 or 5 years through 2 builds with zero issues.
Team Owner
Joined: Nov 2007
Posts: 24,035
Likes: 2,340
From: Gilbert AZ
They can depending on application, but people around here seem to think they are some magic upgrade, when depending on the setup, can have huge downsides with the increased tip weight.
Le Mans Master
Joined: Apr 2011
Posts: 7,820
Likes: 408
From: Montreal
St. Jude Donor '13
Agree..... I'm pretty convince most problems come from guys bolting parts on and having now real clue. Stuff has to work together.
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Safety Car
Joined: May 2006
Posts: 3,683
Likes: 481
From: Potomac MD
If I had the choice and the extra money would go with those TD SS Roller Tipped Rockers they had on the SAM 800 hp build. They appear to be able to take the big spring pressure and they reved the motor to 8,000 + rpm. Expensive I think $1,200 but are a direct bolt in.
Team Owner
Joined: Nov 2007
Posts: 24,035
Likes: 2,340
From: Gilbert AZ
I believe those are the ones you machine the heads for.
Safety Car
Joined: Feb 2007
Posts: 4,684
Likes: 107
From: Opelika Alabama
what are the down sides" they run roller tiped on 10,000 hp top fuel cars bad tips are the least of there problems, mine been on 70.000 miles, bet you I have less valve stem guide wear then you do.
Last edited by CMY SIX; Aug 27, 2016 at 03:29 PM.
Team Owner
Joined: Nov 2007
Posts: 24,035
Likes: 2,340
From: Gilbert AZ
Tip weight in way heavier than stock, weaker arm prone to fracture, arm flex.
I could give a flying **** about valve guide wear, but when I checked at 22k miles on my current 1200rwhp setup, there was no change or sign of wear. Zero, none, nadda. So if you heavier less reliable more expensive roller rockers that limit RPM and would never make it to 7500rpm have less wear than that, then they are magical and adding material back.
A nascar system and a bolt on cheap roller rocker setup is laughable. Might as well compare a matchbox car to a LaFerrari. Not even in the same ballpark.
I could give a flying **** about valve guide wear, but when I checked at 22k miles on my current 1200rwhp setup, there was no change or sign of wear. Zero, none, nadda. So if you heavier less reliable more expensive roller rockers that limit RPM and would never make it to 7500rpm have less wear than that, then they are magical and adding material back.
A nascar system and a bolt on cheap roller rocker setup is laughable. Might as well compare a matchbox car to a LaFerrari. Not even in the same ballpark.
Melting Slicks
Joined: Jun 2006
Posts: 2,462
Likes: 259
From: Miami Florida
I like them any time a possibility of failing parts is eliminated is good for longevity BOT as for me I use light weight all limitations removed parts only as lowest acceptable budget.