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Re: Flywheels & clutch functionality
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Funny but Rob at Action left the step on both FWs , he also turned down the pilot bushing to fit the smaller hole on the A12 FW - tapped it right in, god knows why anyone made that a smaller ID???

Posted on: 2021/11/12 16:41
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Re: Flywheels & clutch functionality
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H-11 FE is the 28mm A12, K24C is 35mm off the A15. Doug in Portland confirmed 35mm of an A14/15 FW & a 28mm off an A12, he measured both so it looks like stock for A14/15 should be 35mm thick.

Both are stock FWs , perhaps the step was milled into it by machine shop or by whoever modified the pilot bearing hole before me. I had the machine shop turn down the bushing so itll fit.

No Toyota FW, both Datsun.

Thanks for putting up the pics Dave , maybe Ill figure out how to load them

Posted on: 2021/11/11 6:40
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Re: Flywheels & clutch functionality
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35mm thick? Wiki says 30mm

Posted on: 2021/11/8 19:42
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Flywheels & clutch functionality
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Im installing the new A12 engine to replace the A15 and the flywheel I had set aside and refaced turns out to be 35mm thick, the one I was running on the A15 was 28mm, apparently a A12 FW, also ran a engine plate 3.25mm & a standard ht bearing carrier 33mm, it had a problem with clutch disengagement so made a longer slave push rod, still never worked right. All coupled to a 60A 5 spd.

I had a brand new Exedy clutch & cover- man, it was hard to push! Planning on running the 28mm FW, standard carrier & no engine plate, sound right for proper clutch operation?

Wiki doesnt say anything about A15 FW's, were they 35mm thick?

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man I hate posting pic's on this site, copied links from Icloud, didn't work. Wouldn't it be easier to be able to pull them direct from our computers or ph's and not have to off site host them....my rant

Posted on: 2021/11/8 17:11
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Re: A12 Crankshaft pilot hole bore dimm's
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Problem solved, took bushing to Machine shop and they turned it down to match the one I pulled !

Still not sure why the smaller bore on the crank, shop suggested crank possibly from an auto trans engine, that make sense?

Posted on: 2021/10/27 15:31
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Re: A12 Crankshaft pilot hole bore dimm's
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I thought they were all the same too!

Ill probably order a few and measure them, seems weird anyone would of machined a crankshaft down in size instead of increasing the bore size....

I could reuse the one I pulled but its a bit sloppy on the input shaft

Posted on: 2021/10/26 15:31
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A12 Crankshaft pilot hole bore dimm's
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Hi All - been awhile since Ive been on here, finally getting back to my coupe project. Started resurrecting an A12 to replace my A15 which keeps eating cams (giving up on solving it....for now at least) A12 was a built race motor which I wor4ked over about 2 years ago, figured out all the valve clearance issues, chamber volumes, has aria forged pistons, worked head and a highly polished crank.

I pulled the pilot bushing out of the crank, measured the ID of the crank bore & its .653, the OD on the bushing I took out is .652, I'd bought a Velao clutch kit awhile back & the bushing that came with it is a National PB-21, it measures .670 OD so Im not cramming a .017 over bush into the crank - what gives??

are there different cranks with different bores? all the bushings I find available are for the .670 OD, I'm going to go measure another A12 bore & see what it says.

I thought all A series cranks were identical save for the stroke, could it be a really early one or possibly from an A10?

any thoughts how to resolve it, havent found a bushing thats .652 available yet...

thanks!

Posted on: 2021/10/26 3:23
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Re: Early A12 fit into later A12 crossmember
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Hey Ernie ! Not really sure of hp goal - main one is to not flatten cam lobes and lifters anymore 😀
It should be sitting at about 9.5-1 comp . Not really sure what to expect.

The original goal was to quit messing w/A15 and simply throw in the A12 I had laying around, you know how that goes, pretty much full rebuild at this point.

Started taking one last look at A15 issues running in car, now on 2nd new fuel pump , even new Chinese s$@t fails. Frustrating, kinda kills the momentum

Posted on: 2020/1/24 16:31
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Re: Early A12 fit into later A12 crossmember
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thanks for fixing the pic's dave, my measurements indicate otherwise as to fit on the right side mount & cross member standoff.

I think the A15 from the back of block to mount is about 8", with the A12 the distance is more like 9.5" - meaning center of mount hole to back edge of block and sandwich plate between engine & trans.

that pushes the mount farther towards the core support by about 1.5", only thing I can think of is making the adapter plate longer that the A15 is using. That s why I was asking about cross members, I always thought it was a stock 73 cross member...

Posted on: 2020/1/24 0:51
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Re: Early A12 fit into later A12 crossmember
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Hey Dave , I knew it was just early and late. for most car mfg-ers you can break down the SN and VIN to glean lots of data about them. There was one image I ran across of the trans ID #s brokendown.

I thought maybe the serial number would tell me the exact age of the block. Not critical just curious. Mines definitely the early one, Front distributor, stepped motor mount boss and fitting into late 1973 crossmember with short left mount boss.

I did try the direct link, it doesnt seem using the preview button lets you see pics in post first either. The frustration with pics is both having to preload them into an off-site host (photobucket) vs already saved on my computers HD plus resize to fit 1200 site posting . And then PB wants you to pay to save pics .

MANY site have simple, direct load to the post features . As a real estate broker the Seattle MLS allows me to highlight and upload 50 pics at a time to a listing-no long way round method there . Obviously a better funded site then 1200 but the ideas the same,
Seems there has to be a better way....

And No disrespect for the Admins who run the site , appreciate them and the site being here, thanks!

Posted on: 2020/1/12 15:48
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