Hand lapping cast iron side plates

Technical info not specifically 1st gen RX7 related.
TOOL
Posts: 2513
Joined: Thu Sep 01, 2011 10:30 am
Location: Var, France (ex NZ, ex UK)

Re: Hand lapping cast iron side plates

Post by TOOL » Thu Feb 18, 2016 6:35 pm

And if you don't want to hand lap your plates, try these guys who come recommended:

http://www.nlrflatlapping.co.uk
Back in sunny France

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gt_james
Posts: 564
Joined: Sun Apr 06, 2014 4:10 pm
Location: Pershore, Worcester UK

Re: Hand lapping cast iron side plates

Post by gt_james » Thu Feb 18, 2016 6:45 pm

I'd be interested to compare the flatness after lapping to before on a CMM or form tester.

spoddy
Posts: 1031
Joined: Sun Jun 19, 2011 10:39 pm
Location: N.Ireland

Re: Hand lapping cast iron side plates

Post by spoddy » Sun Feb 21, 2016 3:47 am

on any rotary engine if rebuilding, is it recommended to skim the side plates?

apexheid

Re: Hand lapping cast iron side plates

Post by apexheid » Sun Feb 21, 2016 9:15 am

spoddy wrote:on any rotary engine if rebuilding, is it recommended to skim the side plates?
Not really, check the wear depth at the spark plug side/opposite
Max is .004 -.006" on N/A for road going and .006" for racing.
For turbo's max .004" due loss of pressure and leaked.
if it is skim by grinder/lapping work. end play must replace and inlet manifold/exhaust header must be drilled out ovally to fit back.
Also important to do when it doing by grinding, plate must be dead square to stationary gear or the E shaft will eat the bearing.. I know cos I've been there.( I was a grinder..)
Too many to talk about it there and that..
if unsure, give to real expert( Don't give to RX8 so-called specialists) to check it out.
Sorry Folk and again.. no photo.

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