Where are the weak links when upgrading power on a Vixen?
Discussion
Rear std diff.
Rear quill shafts
front bearings. Front upright at the top of the threads of the trunnion
seized rear splines
I think you will have plenty in reserve for a few more horses yet though.
Everything in std trim is still pretty much fine. I think people get the most problems when They bang a tuned motor into an old vixen and expect all of the rest of the 40 year old stuff to cope.
If everything is well maintained and inspected, serviced and replaced in a timely manner Then a cooking cross flow won't worry a vixen in std trim.
As ever their is more to a good restoration than just slapping some hammerite onto the chassis.
N
Rear quill shafts
front bearings. Front upright at the top of the threads of the trunnion
seized rear splines
I think you will have plenty in reserve for a few more horses yet though.
Everything in std trim is still pretty much fine. I think people get the most problems when They bang a tuned motor into an old vixen and expect all of the rest of the 40 year old stuff to cope.
If everything is well maintained and inspected, serviced and replaced in a timely manner Then a cooking cross flow won't worry a vixen in std trim.
As ever their is more to a good restoration than just slapping some hammerite onto the chassis.
N
heightswitch said:
front bearings. Front upright at the top of the threads of the trunnion
I'm struggling to understand why a more powerful engine would necessitate upgrading front bearings and front uprights.Surely the demands placed on these particular components are related to the duty cycle/usage of the car rather than the power output of the engine that happens to be pushing that car along?
Monkeythree said:
I'm struggling to understand why a more powerful engine would necessitate upgrading front bearings and front uprights.
Surely the demands placed on these particular components are related to the duty cycle/usage of the car rather than the power output of the engine that happens to be pushing that car along?
A basic physics book might help your understanding?Surely the demands placed on these particular components are related to the duty cycle/usage of the car rather than the power output of the engine that happens to be pushing that car along?
N.
I believe these particular parts are thought by some to be a weak link even in a standard car. Presumably Neil is suggesting that increased lateral stress can be induced when accelerating hard around bends when more power is available? Having said that, presumably the original V6s had the same upright/trunnion combo? I suppose the Tuscan did not produce a lot more power than a hot crossflow but I guess the extra weight up front would also add to the loading under hard cornering?
ATE399J said:
What did the last of the Tuscan V8's use?
http://www.youtube.com/watch?v=A1H8yeePRJUhttp://www.youtube.com/watch?v=29nO7l1NvK8
They used the std componants!
Edited by heightswitch on Friday 18th November 18:46
Edited by heightswitch on Friday 18th November 18:54
heightswitch said:
Rear std diff.
Rear quill shafts
front bearings. Front upright at the top of the threads of the trunnion
seized rear splines
I think you will have plenty in reserve for a few more horses yet though.
Everything in std trim is still pretty much fine. I think people get the most problems when They bang a tuned motor into an old vixen and expect all of the rest of the 40 year old stuff to cope.
If everything is well maintained and inspected, serviced and replaced in a timely manner Then a cooking cross flow won't worry a vixen in std trim.
As ever their is more to a good restoration than just slapping some hammerite onto the chassis.
plus recovery service in case I,m wrong
N
So that will be all the above plus new front lower wishbones or 2 coats of Hammerite on the old onesRear quill shafts
front bearings. Front upright at the top of the threads of the trunnion
seized rear splines
I think you will have plenty in reserve for a few more horses yet though.
Everything in std trim is still pretty much fine. I think people get the most problems when They bang a tuned motor into an old vixen and expect all of the rest of the 40 year old stuff to cope.
If everything is well maintained and inspected, serviced and replaced in a timely manner Then a cooking cross flow won't worry a vixen in std trim.
As ever their is more to a good restoration than just slapping some hammerite onto the chassis.
plus recovery service in case I,m wrong
N
Seriously the only potential weakness if you start piling on the power is the diff and if thats in good order will be more than adequate or most people,s needs
plus recovery service in case it all goes breasts up
Edited by thegamekeeper on Friday 18th November 20:37
Edited by thegamekeeper on Friday 18th November 20:38
I put a TR6 diff in my Vixen....I got a new chassis and had the 'M' series carrier setup put in, so i can go to a Jag if I want.
I noticed the drive shafts with the TR6 diff look beefed up, have bigger UJs etc. Have Same quill shafts though.
Does anyone know what a TR6 diff will handle powerwise ?
I noticed the drive shafts with the TR6 diff look beefed up, have bigger UJs etc. Have Same quill shafts though.
Does anyone know what a TR6 diff will handle powerwise ?
RCK974X said:
I put a TR6 diff in my Vixen....I got a new chassis and had the 'M' series carrier setup put in, so i can go to a Jag if I want.
I noticed the drive shafts with the TR6 diff look beefed up, have bigger UJs etc. Have Same quill shafts though.
Does anyone know what a TR6 diff will handle powerwise ?
New here? I noticed the drive shafts with the TR6 diff look beefed up, have bigger UJs etc. Have Same quill shafts though.
Does anyone know what a TR6 diff will handle powerwise ?
RCK974X said:
YES. But I've had the Vixen ages, along with a 280 wedge.
Welcome. We discussed the advantages and disadvantages of various differentials, in this forum, only a few weeks ago.
Have a look. If you can't find the thread, I'll be glad to help.
At one time, what set this site apart from others, was the excellence of its search function. As the site grew, ...
Best,
B.
Slow M said:
elcome.
We discussed the advantages and disadvantages of various differentials, in this forum, only a few weeks ago.
Have a look. If you can't find the thread, I'll be glad to help.
At one time, what set this site apart from others, was the excellence of its search function. As the site grew, ...
Best,
B.
OOps, sorry, I'll go and have a look.....We discussed the advantages and disadvantages of various differentials, in this forum, only a few weeks ago.
Have a look. If you can't find the thread, I'll be glad to help.
At one time, what set this site apart from others, was the excellence of its search function. As the site grew, ...
Best,
B.
heightswitch said:
ATE399J said:
What did the last of the Tuscan V8's use?
http://www.youtube.com/watch?v=A1H8yeePRJUhttp://www.youtube.com/watch?v=29nO7l1NvK8
They used the std componants!
Edited by heightswitch on Friday 18th November 18:46
Edited by heightswitch on Friday 18th November 18:54
I have had one fail on an ancient Spitfire I once owned so how TVR ever thought they'd stand up to a V8 on a track I'll never know. I guess the answer is that they didn't!
ATE399J said:
Well, he shouldn't have driven over all those kerbs!!!!
I have had one fail on an ancient Spitfire I once owned so how TVR ever thought they'd stand up to a V8 on a track I'll never know. I guess the answer is that they didn't!
The answer was a bit tongue in cheek. in fairness Pauls failure wasn't down to the upright. it was the lower original wishbone which sheared in 2 placs. The car was subsequently fitted with some T45 CDS Variants.I have had one fail on an ancient Spitfire I once owned so how TVR ever thought they'd stand up to a V8 on a track I'll never know. I guess the answer is that they didn't!
The rear quill failure was typical though and in my time I have seen uprights fail at the radius curve on the top of the trunnion thread.
Good servicable and lifed parts though shouldn't worry a crossflow powered vixen. there are some things though which should be considered as service items!!
N.
N.
Thanks for the feedback. The weak links are pretty much as I thought, although I expected to see diff carrier also mentioned - any thoughts?. The reason for the OP is that the longer term plan is to fit a BDA engine (already mentioned in previous posts) that should push out 160-180bhp. What I don't want to do in the short term is throw money into any item which will need upgrading later, so all comments have been appreciated.
Moto
Moto
heightswitch said:
in my time I have seen uprights fail at the radius curve on the top of the trunnion thread.
And That's exactly where my Spit failed. Original question was 'tongue in cheek' too.I would think that as far as the front uprights are concerned it's just as much about the improvements in tyre performance (= increased side load) as power. Having said that, my spit failed going in a straight line - and yes, I had pumped loads of EP90 into my trunnions.
ATE399J said:
And That's exactly where my Spit failed. Original question was 'tongue in cheek' too.
I would think that as far as the front uprights are concerned it's just as much about the improvements in tyre performance (= increased side load) as power. Having said that, my spit failed going in a straight line - and yes, I had pumped loads of EP90 into my trunnions.
This happened to an old school friend of mine too. Nasty accident, with hospital time. Which is why both mine are brand new, along with the trunions and all ancillariesI would think that as far as the front uprights are concerned it's just as much about the improvements in tyre performance (= increased side load) as power. Having said that, my spit failed going in a straight line - and yes, I had pumped loads of EP90 into my trunnions.
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