[Fot] TR CHASSIS FATIGUE - A CAUTIONARY TALE

[yellow04 at tr4racer.com]

Good question.

The ladder frames under the TR2-TR4 seem to be much more rust resistant than 
the wishbone frames under the TR4A-TR6. I have come across numerous rusty 
project cars over the years, and have seen plenty of rusted out TR3's and 
4's with what appear to be good frames, but I have never seen a rusty TR4A, 
250 or 6 that did not need extensive frame work. I should add I have come 
across plenty of nice wishbone framed Triumphs sitting on frames in dire 
need of attention.

I know the spring towers and cross members are different between the ladder 
and wishbone frames, and I believe the newer wishbone frame design is more 
robust. However, because of their propensity for rust, I'd venture a guess 
that the wishbone framed cars share the probability of failure in the areas 
Joe mentioned.

Remember, the stess we put on these cars running them on track with today's 
racing tires is way beyond what the designers ever dreamed possible. You 
need to reinforce many key areas, keep the frame clean, paint it with 
something that will not hide cracks, and be very diligent with close 
inspections between race weekends.

Henry
yellow04 at tr4racer.com
----- Original Message ----- 
From: "sherry robyn" <sherryjimmy6116 at att.net>
Subject: Re: [Fot] TR CHASSIS FATIGUE - A CAUTIONARY TALE


> Do TR6s (1974) have this weakness also?