2.5 is not enough.
As Chris has said, the wet-liner engines need more.
I set them to at least 3 1/2 thou.
Glen
-----Original Message-----
From: john hasty <jhhasty@gdhs.com>
To: 'MadMarx' <tr4racing@googlemail.com>; fot <fot@autox.team.net>
Sent: Tue, Sep 11, 2012 11:41 am
Subject: Re: [Fot] Never be beaten by equipment
We use JE pistons and rings with a clearance of 2.5 thou. Which I think is
about 1/2 of a thou. Less than Chris uses.
John H. Hasty
Attorney At Law
Guthrie, Davis, Henderson & Staton, P.L.L.C.
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Charlotte, North Carolina 28203-5113
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-----Original Message-----
From: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] On
Behalf Of MadMarx
Sent: Tuesday, September 11, 2012 11:24 AM
To: fot@autox.team.net
Subject: Re: [Fot] Never be beaten by equipment
I had the same trouble with Wiseco pistons.
Maybe they expand a lot.
I run as piston to wall clearance 0.13mm.
Never believe what the piston manufacturer says.
Won't work on a wet liner Triumph engine.
The liners deform under heat and getting oval.
More clearance is needed as normal.
At the current engine I try to install old liners in the same direction when
they were installed the first time in hope the deformation is smaller.
Chris
-----Urspr|ngliche Nachricht-----
Von: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] Im
Auftrag von Robert Blake
Gesendet: Dienstag, 11. September 2012 17:08
An: fot@autox.team.net
Betreff: [Fot] Never be beaten by equipment
Pops and I had a less than excellent weekend at TWS it would true to say
that we were beaten by equipment, one of us physically.
We just put a new engine
in Dads #14. The second one since December. We built this one with Wiseco
pistons, stock liners bored to 87+.005 on 1-3 and +.006 on number 4. This
resulted in the engine lasting most of the day Friday for test and tune. On
his last run we did a plug check. We had been trying to dial in his mixture
all day and moving from a lean condition as evidenced by previous plug cuts
in the day. After adjusting the mixture, reinstalling the plugs, gapping
points, and rechecking timing we started the engine to hear a horrible
clatter from within. Same clatter that dad had heard at the Mitty so we
feared the worst.
Later that evening he and Bob Kramer confirmed that #4 piston skirt was
scuffed again. The same thing happened on the previous engine at the Mitty.
Oil pressure was great all day (80 psi from 3000rpm up) the water temp never
went above normal range.
So other than lack of piston to liner clearance, what causes pistons skirts
to scuff on the liner? Can a lean mixture on the rear carb cause this
without showing up as a hot running condition?
On to my
issue.
My aluminum hood pins broke on the TR3 on the back straight.
Unfortunately, the passenger hinge snapped but the drivers side did not. The
hood bent back and slapped my helmet pretty good (beaten by my equipment).
Never thought of it that way before. Not pleasant. So I am in search of a
decent bonnet. It is for a 58 TR3A. I am not too picky but proximity to TX
is a major consideration.
Info on both issues is appreciated.
Greg
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