Page 1 of 1
Piston clearance, engine building
Posted: Sat Aug 16, 2014 5:20 pm
by ralleyquattro
Hi guys,
For engine builders.
The alloy block I got has a bore of 79.5mm.
The Sport pistons are marked as 79.47mm.
The question is, is this proper clearance i.e. 0.03mm??
I looked online but have not found a definite guideline for piston/cylinder clearance.
I would like to order the copies of the piston from JE, but would like to confirm above before going ahead.
Thank you in advance!
Cheers
Re: Piston clearance, engine building
Posted: Sat Aug 16, 2014 5:44 pm
by chaloux
JE will recommend a clearance depending on your application and chosen alloy, but it will likely be 3 thousandths or thereabouts.
As long as you know your bore they will make whatever you need. Going to hone as well or is it fresh?
Re: Piston clearance, engine building
Posted: Sat Aug 16, 2014 6:04 pm
by PRY4SNO
Curious, why JE? Why not Mahle?
Re: Piston clearance, engine building
Posted: Sat Aug 16, 2014 6:09 pm
by chaloux
Or wiseco, or any of the others?
Re: Piston clearance, engine building
Posted: Sat Aug 16, 2014 6:57 pm
by my2000apb
mahle FTW
Re: Piston clearance, engine building
Posted: Sat Aug 16, 2014 9:02 pm
by ralleyquattro
Does Mahle offer custom pistons?
Audi only had one SQ piston in stock, they are now NLA.
Looking for suggestions/experience.
Thank you
Re: Piston clearance, engine building
Posted: Sat Aug 16, 2014 11:08 pm
by PRY4SNO
http://www.theprojectpad.com/viewtopic.php?t=281From Mahle:
These would be a custom part for us
...
$1,320 for pins clips and rings , US funds.
10-12 weeks for completion
Coatings are included , skirt and pin and ring coatings come standard on every MAHLE piston.
Kind regards,
Jason Griffin
jason.griffin@us.mahle.com
Re: Piston clearance, engine building
Posted: Sat Aug 16, 2014 11:11 pm
by PRY4SNO
I would have went Wossner for cost:value if I'd gone full custom on my stoker build, but I got a good deal on a stroker set up with Wisecos. Only difference, so far as I can tell, was that the Wossner pistons are fully built in-house in Germany, from forging to delivery. Mahle, while nice, were an expensive way to rock out an OEM sticker on a custom build.
In your case, however, I could see the appeal. It just feels right.
Re: Piston clearance, engine building
Posted: Sun Aug 17, 2014 10:48 am
by audifreakjim
I have been really happy with my wiseco pistons, and I think they are quite a bit cheaper than JE
Re: Piston clearance, engine building
Posted: Sun Aug 17, 2014 7:28 pm
by ralleyquattro
PRY4SNO wrote:http://www.theprojectpad.com/viewtopic.php?t=281
From Mahle:
These would be a custom part for us
...
$1,320 for pins clips and rings , US funds.
10-12 weeks for completion
Coatings are included , skirt and pin and ring coatings come standard on every MAHLE piston.
Kind regards,
Jason Griffin
jason.griffin@us.mahle.com
Wow, thank you for that, had no idea, will be emailing Jason ASAP..
I wonder if they can make it from an Audi P/N.. that would be sweet!
Cheers
Re: Piston clearance, engine building
Posted: Mon Aug 18, 2014 1:29 am
by PRY4SNO
I'd think if they didn't have the wherewithal to build off a PN a sample piston would do the trick
Re: Piston clearance, engine building
Posted: Mon Aug 18, 2014 6:54 pm
by ralleyquattro
In contact with Mahle, they will find a set of original drawings and make me additional 4 from that. All they needed was the stmping code from the bottom of the piston which is 79P11+ for your reference.
If I had known I would never bother buying the one from Audi Tradition, it was twice of what Mahle will charge me.. :(
Oh well.
Re: Piston clearance, engine building
Posted: Mon Aug 18, 2014 7:15 pm
by scubagli
It will make a sweet paper weight.
Re: Piston clearance, engine building
Posted: Tue Aug 19, 2014 2:14 pm
by my2000apb
scubagli wrote:It will make a sweet paper weight.
YES!!!!!!!!!!!
get five fresh ones
Re: Piston clearance, engine building
Posted: Tue Aug 19, 2014 4:49 pm
by GTJeff
my2000apb wrote:scubagli wrote:It will make a sweet paper weight.
YES!!!!!!!!!!!
get five fresh ones
They might be using the same drawings but I bet there isn't a snowballs chance in hell they will completely match your piston.
Re: Piston clearance, engine building
Posted: Wed Aug 20, 2014 5:44 pm
by ralleyquattro
They need the piston, they located the drawing for the blank but not the piston itself, so it's on its way.
Not bad, they will cost $220 each!
BTW I am dealing with another contact now:
Tony Ford
Phone: 1 (828) 650-0814
tony.ford@us.mahle.com