Jump to content
Sign in to follow this  
COOCHaDAMus

Piston swap issue

Recommended Posts

i replaced pistons & rings in 80' 210 A14 engine to A15 pistons & rings, found that pistons at TDC don't reach top of bore. pics are #1 & #4 at TDC Is this gonna cause any issues.

 

 

 

http://s1203.photobucket.com/user/COOCHaDAMus/media/image1_zpszofotyxt.jpg.html

 

http://s1203.photobucket.com/user/COOCHaDAMus/media/image2_zps1bepzn1c.jpg.html

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Share this post


Link to post

You need to find another photo hosting service, Photolame isn't going to work anymore.

The Jason Grey info doesn't include A series engines, so you will have to wait for someone that knows A blocks to tell you if it will work or not.

Share this post


Link to post

That year should be a common block, but the crank is different...the length of throw. I would venture to guess that A15 pistons n rods need to match up with an A15 crank.....I guess

 

The issue is a significant loss of compression.

 

 

Edit:

 

Info from the net

 

"A15 runs 30mm pin height where A14 is 32.5 so by using the UC piston the top of the piston would be a fair bit down the bore."

Share this post


Link to post

If the A15 has a different crank(longer stroke), and the rod is the same, then the wrist pin location would likely be higher in the piston, you would then likely need to use the A15 crank also.

Compression ratio loss could be significant, Dmike might know the answer to this, hopefully he will read this and reply.

What head do you have, open or closed chamber?

  • Like 1

Share this post


Link to post

Wow, that is a serious gap, I would bet you would b down to difficult starting and significant loos of power.

Share this post


Link to post

I would need the combustion chamber and the piston dish volume but yeah that's some serious loss. Flattops would help, but...

 

A14 stroke is 77mm and A15 is 82. This is 5mm and 1/2 that is 2.5mm. Would not the longer A14 rods fix this?

  • Like 1

Share this post


Link to post

Thought about this on way to work. If A15 pin height is 30 and A14 is 32.5 then they both use the same rod length???

  • Like 1

Share this post


Link to post

Either buy the correct pistons, or an A15 crank.

Share this post


Link to post

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×

Important Information

By using this site, you agree to our Terms of Use.