[Fot] Never be beaten by equipment

[tr4racing at googlemail.com]

At what bore size?

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-----Original Message-----
From: fubog1 <fubog1 at aol.com>
Date: Tue, 11 Sep 2012 16:45:10 
To: <tr4racing at googlemail.com>; <johnstydo at gmail.com>
Cc: <fot at autox.team.net>
Subject: Re: [Fot] Never be beaten by equipment


 Well not to start a controversy, but I have one on the bench right now, torqued down and ready to go, and the mics don't lie.
The liners tend to waist down around the lower register.
Glen 


 

 

-----Original Message-----
From: tr4racing <tr4racing at googlemail.com>
To: fubog1 <fubog1 at aol.com>; johnstydo <johnstydo at gmail.com>
Cc: fot <fot at autox.team.net>
Sent: Tue, Sep 11, 2012 4:26 pm
Subject: Re: [Fot] Never be beaten by equipment


We did a lot of testing with torque plate and we found NO difference with or 
without.
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-----Original Message-----
From: fubog1 <fubog1 at aol.com>
Date: Tue, 11 Sep 2012 16:21:56 
To: <johnstydo at gmail.com>
Cc: <mmoore at wave1.net>; <jhhasty at gdhs.com>; <tr4racing at googlemail.com>; 
<fot at autox.team.net>
Subject: Re: [Fot] Never be beaten by equipment


 The other point that should be mentioned is that these liners should be honed 
using a torque plate.
They get out of shape once they are clamped down in place.
FWIW I use JE pistons and set them at .004, usually with coated skirts as an 
added insurance policy against scuffing.
Glen

 

 

-----Original Message-----
From: John Styduhar <johnstydo at gmail.com>
To: fubog1 <fubog1 at aol.com>
Cc: mmoore <mmoore at wave1.net>; jhhasty <jhhasty at gdhs.com>; tr4racing 
<tr4racing at googlemail.com>; fot <fot at autox.team.net>
Sent: Tue, Sep 11, 2012 2:42 pm
Subject: Re: [Fot] Never be beaten by equipment


My math shows that MadMarx is running .005" piston to wall clearance (.13mm/25.4 
mm/inch=.005.  Wiseco's suggested clearance for their forged 87mm slugs is .004, 
but others (BFE)  have recommended .006, which is what my machinist is honing 
to. 

On Tue, Sep 11, 2012 at 1:16 PM, fubog1 <fubog1 at aol.com> wrote:

 I'll try this again, my reply had too much text.
The manufacturers will call out a recommended clearance, but that's all it is.
The operating speed, temperatures, cooling systems etc all are variables.
Generally the harder it is run, the more clearance it needs.
Also pistons can scuff during warm-up, under certain conditions, so it's a
good thing to get it up to temp before flogging it hard.
Glen
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