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-   -   My 88 Olds wagone U/SA 10 Pennies (https://classracer.com/classforum/showthread.php?t=56442)

SSDiv6 08-29-2017 03:24 PM
Re: My 88 Olds wagone U/SA 10 Pennies
 
Quote:
Originally Posted by Bob Mulry (Post 543189)
I didn't see a spec for lifter diameter in the NHRA Technical Bulletin for a 1988 Oldsmobile with a 307ci engine, but classracerinfo.com said .842 lifter?????

On line it looks like only the early Oldsmobile's take the .921 lifters????

Have you measured the lifter bores in your 307 block????

I am just confused
Bob,

1966-1967 400 and 425 Olds engines use a .921 Dia conventional hydraulic lifter.

However, the 1985-1988 Olds 307 with peanut ports, rated at 138 HP, and the 1981-1985 Olds 350DX diesel engine use a .921 hydraulic roller lifter.

Mark Yacavone 08-29-2017 04:06 PM
Re: My 88 Olds wagone U/SA 10 Pennies
 
Quote:
Originally Posted by SSDiv6 (Post 543074)
Mark,

Like I shared with Jeff, be careful with the washers.

Commercial washers, even the high strength ones, are usually Chinesium and will deform.

Talking from actual experience with some lifters I shimmed with high grade hardened washers and they squeezed to a thinner dimension.

Ended buying some 7075-T6 Aluminum round stock and cut it to the proper length.
I will plead guilty of not using much RPM and valve spring pressure on our latest combo.
So, when in doubt, leave it to the engineer.

SSDiv6 08-29-2017 07:15 PM
Re: My 88 Olds wagone U/SA 10 Pennies
 
Quote:
Originally Posted by mark yacavone (Post 543198)
i will plead guilty of not using much rpm and valve spring pressure on our latest combo.
So, when in doubt, leave it to the engineer.
lol!

Jeff Stout 09-03-2017 04:59 PM
Re: My 88 Olds wagone U/SA 10 Pennies
 
Here is rear end set up I hope for the last time. I think pattern is good as it took around 6 adjustments to get this pattern. Scored a set of used complete wild wood brakes. $215 shipped. The rotors were shot but I have a new set in the drawer that are drilled and were spares from old car I sold. Also the caliper mounts have a large hole for big Ford bearing that I will need to address. Total $6862.98

https://i.imgur.com/NhgtBZL.jpg

Bunkster 09-04-2017 01:25 PM
Re: My 88 Olds wagone U/SA 10 Pennies
 
Quote:
Originally Posted by Jeff Stout (Post 544001)
Here is rear end set up I hope for the last time. I think pattern is good as it took around 6 adjustments to get this pattern. Scored a set of used complete wild wood brakes. $215 shipped. The rotors were shot but I have a new set in the drawer that are drilled and were spares from old car I sold. Also the caliper mounts have a large hole for big Ford bearing that I will need to address. Total $6862.98

https://i.imgur.com/NhgtBZL.jpg
Ratio?

Jeff Stout 09-04-2017 06:48 PM
Re: My 88 Olds wagone U/SA 10 Pennies
 
Quote:
Originally Posted by Bunkster (Post 544115)
Ratio?
6.14. with biggest 30x9 I could find. I've been told I should go the other way. 5 something ratio with a 27,28 tall tire but this is what I found for now

GTOMayhem 09-05-2017 09:19 AM
Re: My 88 Olds wagone U/SA 10 Pennies
 
Quote:
Originally Posted by Jeff Stout (Post 544191)
6.14. with biggest 30x9 I could find. I've been told I should go the other way. 5 something ratio with a 27,28 tall tire but this is what I found for now
OK, stupid question time. What are the advantages/disadvantages to larger vs smaller tires with corresponding ratio changes? Is it because of the low HP engine? Big car?

Rick Thomason
GTOMayhem

Jeff Stout 09-05-2017 09:55 AM
Re: My 88 Olds wagone U/SA 10 Pennies
 
Quote:
Originally Posted by GTOMayhem (Post 544279)
OK, stupid question time. What are the advantages/disadvantages to larger vs smaller tires with corresponding ratio changes? Is it because of the low HP engine? Big car?

Rick Thomason
GTOMayhem
Some have been saying that I don't need to drag a big tire all the way done the track when I'm a low HP car.

nickh 09-05-2017 11:29 AM
Re: My 88 Olds wagone U/SA 10 Pennies
 
Jeff are you looking at the lightweight radial or is that bad for such a heavy car?

Jerry Terry 09-05-2017 11:29 AM
Re: My 88 Olds wagone U/SA 10 Pennies
 
They are probably right Jeff, when i raced the1968 BelAir wagon it was hard pulling those tires but actually we started airing them up a little at a time and we would go faster and it still hooked okay it also depended on the track but it hooked almost everywhere.
Jerry


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