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Re: [Fot] Spitfire Flywheel Bolts

To: "'Barr, Scott'" <sbarr@McCarty-Law.com>, <robert@mackenzie.aero>,
Subject: Re: [Fot] Spitfire Flywheel Bolts
From: "Norlin Engineering" <norlinengineering@comcast.net>
Date: Wed, 26 May 2010 08:36:29 -0700
ARP Bolts and the crank and flywheel have been drilled and the crank tapped
for 3 additional bolts.  7 bolts and 1 dowel pin.

Jim Norlin

-----Original Message-----
From: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] On
Behalf Of Barr, Scott
Sent: Wednesday, May 26, 2010 5:07 AM
To: robert@mackenzie.aero; fot@autox.team.net
Subject: Re: [Fot] Spitfire Flywheel Bolts


I've been using ARP flywheel bolts in my Spitfire and have had no trouble
with them.

Scott B.

----- Original Message -----
From: fot-bounces@autox.team.net <fot-bounces@autox.team.net>
To: fot@autox.team.net <fot@autox.team.net>
Sent: Tue May 25 22:06:46 2010
Subject: [Fot] Spitfire Flywheel Bolts

I have been building up a performance 1500 engine for my '79 Spitfire
street/autocross car. Starting with a early 1500 block with flat-top
pistons, I had  all the spinning bits dynamically balanced and installed one
of Ted's 275-4 cams. 9:1 CR topped off with  a ported head with custom
bee-hive valve springs by Costa Mesa R&D.  All in all a solid but not over
the top spec looking more towards reliability and drivability over outright
performance. One choice I made was to stick with a stock flywheel.  When I
installed it I used new bolts from a reputable specialist vendor.  I have
heard that one should not re-use the original bolts and I have also read the
ARP bolts are higher in shear strength but tend to be brittle and break. The
engine ran fine on first start but after a 45 min run-in the first time I
opened the throttle and brought it up to some serious RPM (5500 +) the
flywheel bolts failed.

Questions:
What is everybody else using in their full race motors?
Could this just be a bad bolt or two?
What are your thoughts on APR vs stock hardware?

Robert MacKenzie
NASS # 511
Austin Texas
'79 1500 (street)
'62 Spitfire 4 (race) _______________________________________________
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