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sixties stroker cranks
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sportee
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PostPosted: Tue Nov 29, 2005 12:14 pm    Post subject: sixties stroker cranks Reply with quote

other than the okrasa what options are there for 69mm counterweighted cranks for the 40 hp motor. it has to be in the mid sixties era (or earlier).

i know that Empi had a 69mm but no counterweights.
Okrasa had their counterweighted 69mm.
SPG had their roller crank in 69mm.

but who else made one?
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veedubcrazy
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PostPosted: Tue Nov 29, 2005 12:18 pm    Post subject: Reply with quote

hirth comes to mind, but they could have merged with someone else. dont know who that would be. dave.
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DaveM
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PostPosted: Tue Nov 29, 2005 12:32 pm    Post subject: Re: sixties stroker cranks Reply with quote

sportee wrote:
other than the okrasa what options are there for 69mm counterweighted cranks for the 40 hp motor. it has to be in the mid sixties era (or earlier).
i know that Empi had a 69mm but no counterweights.
Okrasa had their counterweighted 69mm.
SPG had their roller crank in 69mm.
but who else made one?


Is that you Chad? I recognize the car in the avatar.

Anyway, don't forget there were also 74mm stroker cranks for the 40hp... although I have yet to find one. I think spg also made a 74mm.

My '67 SCAT catalog lists a crank to make a 40hp in to a '1750cc' motor. They list it as 'theirs'.
http://www.amayesing.com/scat67cat.htm
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sportee
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PostPosted: Tue Nov 29, 2005 12:38 pm    Post subject: Reply with quote

Yup. its me. i am building 2 engines for my car. one 36hp okrasa engine as original and one 69x83 from a 40 hp case for racing (i dont want to blow up the okrasa engine)

im looking for a not-so-rare counterwieght crank with 69mm stroke for the engine but i still have to be in the mid sixties production area for vintage racing.
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Jake Raby
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PostPosted: Tue Nov 29, 2005 2:12 pm    Post subject: Reply with quote

Call DPR machine and have Jose make you one up.. He has done it for me before...
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sportee
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PostPosted: Tue Nov 29, 2005 2:56 pm    Post subject: Reply with quote

i guess when it comes down to it do i have to have a counterweighted crank?

i know that i can use a stock 69mm crank in the 40 hp case. (and they were avilable in 1966)
once its all ballanced how would it compare to a counterwighted crank? im only going to be pushing about 80 hp. and 5000 rpm's max.

i know that counterwieghted is better but im only vintage racing. opinions on counterwieghts vs none?

can anyone comment on the strength of the stock 69mm cranks?
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RIS
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PostPosted: Tue Nov 29, 2005 3:22 pm    Post subject: Reply with quote

In the racing you will be doing how long of a consecutive period will the engine be running above 4500rpm?
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wheel607
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PostPosted: Tue Nov 29, 2005 3:43 pm    Post subject: Reply with quote

Jose at DPR as said....counterweighted only, it really doesnt cost that much, its cheap insurance, and he does beautiful work!
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sportee
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PostPosted: Tue Nov 29, 2005 3:43 pm    Post subject: Reply with quote

consecutively above 4500? not sure but it will be running in the higher rpm range. i plan on limiting it at 5000. im sure it will be quite steadilly run betwenn 3500 and 5000. ive never driven a vw full out before so i cant say where the rpms would be.
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RIS
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PostPosted: Wed Nov 30, 2005 12:52 pm    Post subject: Reply with quote

Quote:
consecutively above 4500? not sure but it will be running in the higher rpm range. i plan on limiting it at 5000. im sure it will be quite steadilly run betwenn 3500 and 5000. ive never driven a vw full out before so i cant say where the rpms would be.


Non-counterweighted cranks will hold up to short bursts above 5,000rpm, longer durations at higher rpms will result in diminished case life.

If you're going to limit the engine to 5,000rpm you should be good without counterweights, but if you think there's a chance of seeing above that for any length counterweighting the crank now will be a $$$ saver. Losing races and having to rebuild later is just going to hurt the wallet even more.

I think a 69mm roller crank with aluminum flywheel would be awesome for what you're doing.
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gears
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PostPosted: Wed Nov 30, 2005 3:21 pm    Post subject: Reply with quote

I've seen a fair number of the 69 stroke 40hp SPGs in my day. Someone was selling new ones just a few years ago for cheap.
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DaveM
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PostPosted: Wed Nov 30, 2005 3:31 pm    Post subject: Reply with quote

there are a bunch of junk spg cranks out there... I wouldnt buy one if it wasnt NOS or near new. If the mains need polishing, think about what the rod journals need and it's quite expensive to have one of these refurbished. Good ones will cost accordingly.
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