donkelly23 Don Kelly Charleston, SC (130 posts) Registered: 07/21/2011 05:13PM Main British Car: 1980 TR7 V8 Z28 FI ECM 4.0 |
Rover Lifter Preload
As noted I am trying to set my preload on my 4.0. My initial measurement of #1 cyl. using the wire feeler gauge method was bigger than the wire measuring tools I have.
So I created an aluminum shim measuring .036 and installed 4 on the odd bank. Here are my numbers All numbers w/o the 0 in the front 52/52 37/32 32/3/ 35/23 Then installed those shims on the even side 55/52 18/42 52/56 32/46 Using brand new dry lifters and brand new push rods (Smith Bros) The rocker assembly is stock from an 80 TR8. What could cause such radical numbers. Was told to add up the banks to get an average on each side and then figure what I would need to equal about .034 (Number differed by everyone) Would appreciate the feedback as I am a duface when it comes to all things valve train |
BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6470 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: Rover Lifter Preload
I'd go for the .040-.080" range myself. Less chance of lifter tap.
Jim |
donkelly23 Don Kelly Charleston, SC (130 posts) Registered: 07/21/2011 05:13PM Main British Car: 1980 TR7 V8 Z28 FI ECM 4.0 |
Re: Rover Lifter Preload
Books say 20-60
So maybe go higher average than the 34 |
BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6470 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: Rover Lifter Preload
I normally shoot for .060"
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donkelly23 Don Kelly Charleston, SC (130 posts) Registered: 07/21/2011 05:13PM Main British Car: 1980 TR7 V8 Z28 FI ECM 4.0 |
Re: Rover Lifter Preload
Swapped the rocker assemblies and this is what i got.
Remember .036 shim under assemly New Even- 18/22 54/34 37/32 52/42 Odd- 36/42 22/42 18/36 56/42 |
mstemp Mike Stemp Calgary, Canada (223 posts) Registered: 11/25/2009 07:18AM Main British Car: 1980 MGB Rover 4.6L |
Re: Rover Lifter Preload
Don,
Who did your heads? A properly set up head should have all valve heights the same should it not? So in theory the clearances should also be the same unless the rocker arms are worn in varying arrays. |
donkelly23 Don Kelly Charleston, SC (130 posts) Registered: 07/21/2011 05:13PM Main British Car: 1980 TR7 V8 Z28 FI ECM 4.0 |
Re: Rover Lifter Preload
That what perplexes me
The heads were done by Woody and have about 600 miles on them over 4 years. The rockers are stock TR8 ones with 100K about on them New lifters and push rods. The cam is the same age as the heads and the block is brand new |
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donkelly23 Don Kelly Charleston, SC (130 posts) Registered: 07/21/2011 05:13PM Main British Car: 1980 TR7 V8 Z28 FI ECM 4.0 |
Re: Rover Lifter Preload
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donkelly23 Don Kelly Charleston, SC (130 posts) Registered: 07/21/2011 05:13PM Main British Car: 1980 TR7 V8 Z28 FI ECM 4.0 |
Re: Rover Lifter Preload
Just for my understanding...
Why was this moved? Here's the Forum title engine swaps and other performance upgrades, plus "factory" V8s (Stag and TR8) It is an engine swap and it is a Triumph Sports car |
Moderator Curtis Jacobson Portland Oregon (4577 posts) Registered: 10/12/2007 02:16AM Main British Car: 71 MGBGT, Buick 215 |
Re: Rover Lifter Preload
If this thread were about how to make a Rover engine fit inside a Triumph, it would belong in the Triumph section. For example: "What Rover engine mounts, or headers, or radiator hoses work best in a Triumph chassis?" Putting this thread in the engine section welcomes participation from everyone with an interest in Rover engines or valvetrain set-ups.
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donkelly23 Don Kelly Charleston, SC (130 posts) Registered: 07/21/2011 05:13PM Main British Car: 1980 TR7 V8 Z28 FI ECM 4.0 |
Re: Rover Lifter Preload
Thanks Curtis
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donkelly23 Don Kelly Charleston, SC (130 posts) Registered: 07/21/2011 05:13PM Main British Car: 1980 TR7 V8 Z28 FI ECM 4.0 |
Re: Rover Lifter Preload
Huston, I think we have a problem.
I need you fine experts to let me know if I do. I was told that I should use a straight edge to measure across my valves and springs to make sure they are level. So Since I am working the even side of the engine I pulled the rockers< again, and layed my framing square across the top. Yikes. The exhaust valve (I think), is a lot higher than the rest. With the edge on# 8-4 I have .016 on the outside valve on 2 When I reverse the edge and lay it on 2 & 4 I have like .04 on the outside valve on 8. What says you all?? |