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70 ironhead piston basket

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  #81  
Old 27th November 2019
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Quote:
Originally Posted by Ferrous Head View Post
Sorry, I just noticed this thread.

This is a 70 engine right ? So900 cc's.

It is quite easy to build a stock bore stroker with these engine.

It would have been good had you measured the stroke before you sent the engine off for a rebuild.

If the wheels are KH or S&S or T*O and they are 4 1/2 or 4 5/8 stroke all that requted is a new set of stroker pistons from JE. The make them in stk to 0.06 over sizes. I have the order number for them if you go that way.

These pistons do away with the need for stroker plates and different inlet manifolds.

Wrist pin is higher in the piston.

S&S will actually sell you a new rotating assembly that is balanced for whatever pistons you buy. Last one I bought was about $1200. Pistons I paid less than $400 for.

Sorry, I could have saved you a whole lot of trouble has I seen this earlier.
Thank you. I don't believe the engine has been opened up yet. I'll take your post to my builder.
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  #82  
Old 27th November 2019
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In 45 years of turning wrenches I have never seen pistons by themselves change the stroke. They will change compression. As far as I know, crank throw is the only thing that will change stroke. You can change rod length by itself also but that only changes piston speed—-not stroke.
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  #83  
Old 28th November 2019
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the raised wrist pin height keeps the pistons from extending past the top of the cylinder.with the increased stroke.the pistons don't change the stroke.S&S has been selling that type of piston since the early 70's for 3-3/16'' bore.i bought several sets
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  #84  
Old 28th November 2019
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No, these pistons do nothing to change the stroke.
The flywheels determine the stroke.
These are "Stroker" pistons, designed to facilitate building stroker engines.

By moving the piston pin location you can set the piston lower in the bore.

With these piston the piston pin actually intersects the ring lands. That's not a problem by the way - you just use buttons on the ends of the pins.

The JE part number is 32:1637 from job number 915068. That's for a set of 020 overs.
the weight is 349 grams.

I also had Nick Arias from ARIAS make me a custom set and they were $400 when I bought them about 4 years ago. He can make anything you want.

I did have a spare set of 30 overs here but can't seem to put my hands on them at the moment.

If you look at the pistons in this ebay ad you can see an example of the stroker style pistons we now use.
The 800 versions aren't a stock item anymore but if you ask you may find they can be had on "special order" meaning you need a dealer to fill in the necessary paperwork for you. JP Cycles did this for me.

https://www.ebay.com/itm/S-S-Cycle-H...kAAOSwKX9biG64


As you can see from the ad it;s not that expensive if you need to do major surgery on an engine anyway. The cost of rebuilding and trueing the wheels goes away. The costs of new bearings, shafts and whatever goes away. The cost of balancing goes away.

Throw in a new set of aftermarket cylinders while your at it. Buy a GOOD set of second hand Sifton cams and a used S&S Super B.

Now you have a super strong engine with 50% more torque than a stcoker.

No secrets here.
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