Gtir Motorsport club

Welcome to the largest Nissan Pulsar & Sunny GTI-R Forum. Masses of info, friendly members, cars for sale, lots of spares. Best forum on the net by far. Everything your gtir needs is here.


You are not connected. Please login or register

Gtir Motorsport club » General Discusion » Gtir related Discussion » Ring gaps

Ring gaps

Go down  Message [Page 1 of 1]

1 Ring gaps on 14th May 2018, 8:35 pm

Whytie

avatar
I’ve got an engine in I’m building for someone

Not much info, looks like forged pistons from acl, which I’ve heard are made by mahle

Any ways I’ve tried to find specs of the ring gaps, but Internet is not my best friend. I know what stock are, just can’t find info on mahle. 0.4 and 0.7 I have sitting rings on block,

2 Re: Ring gaps on 14th May 2018, 8:58 pm

Gostek

avatar
Events Organiser
Events Organiser
TOP COMPRESSION RING
Ductile, Grey Iron & Steel = 0.013 inch

INTERMEDIATE COMPRESSION RING
Grey Iron = 0.013 inch
that's for 86mm piston (3.38inch) moderate performance


RECOMMENDED END-GAP
TOP COMPRESSION RING
Ductile, Grey Iron & Steel 4.000” Bore Example Recommended Min. Gap Factor
Moderate Performance .016 - .018 (.004 per inch of bore diameter)
Drag Racing, Oval Track .018 - .020 (.0045 per inch of bore diameter)
Nitrous Oxide -- Street .020 - .022 (.005 per inch of bore diameter)
Nitrous Oxide -- Drag .028 - .030 (.007 per inch of bore diameter)
Supercharged .024 - .026 (.006 per inch of bore diameter)
INTERMEDIATE COMPRESSION RING
Grey Iron 4.000” Bore Example Recommended Min. Gap Factor
Moderate Performance .020 - .022 (.004 per inch of bore diameter)
Drag Racing, Oval Track .022 - .024 (.0055 per inch of bore diameter)
Nitrous Oxide -- Street .024 - .026 (.005 per inch of bore diameter)
Nitrous Oxide -- Drag .028 - .030 (.007 per inch of bore diameter)
Supercharged .024 - .026 (.006 per inch of bore diameter)

That's what I've found for Mahle

I've built few engines wits cp wosnier and je pistons and usually go for 0.5mm top 0.6mm mid
Bigger gap won't hurt it


_________________

3 Re: Ring gaps on 14th May 2018, 9:00 pm

Whytie

avatar
Where did you find that info I searched for a while.

It’s not a new engine here so was just wanting to check

4 Re: Ring gaps on 14th May 2018, 9:01 pm

Gostek

avatar
Events Organiser
Events Organiser
https://www.mahle-aftermarket.com/media/local-media-north-america/support_technical_bulletins_pdfs/tb7002.pdf


_________________

5 Re: Ring gaps on 14th May 2018, 9:06 pm

Whytie

avatar
Cheers for that, seems ok then, can tell by looking at block that these pistons do a fair bit of piston slap, I prefer cp’s myself can’t go wrong with them

6 Re: Ring gaps on 14th May 2018, 9:08 pm

Gostek

avatar
Events Organiser
Events Organiser
No worries mate. I think it was nearly the same for CP


_________________

Sponsored content


Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum