Turbo driveshafts. - Page 2

grant620 · #1 23rd August 2006, 23:51

Yes, I think thats it John.
WHY hasn't Mark/Marlin said this???
I get quite wound up by several issues that have popped up. It's like the R+D is done by customers, not by Marlin!!!

holgate86 · #2 24th August 2006, 20:14

I originally had long turbo shaft and short turbo shaft . after a problem with the longer shaft popping out I changed to diesel long shaft. the car was ok until I drove it round a track which broke the cage on the outer cv of the short shaft. the current setup is back to original turbo long driveshaft having moved the engine as far right as it will go. it has not been tested on a track yet but so far so good.

brian

alackofspeed · #3 8th September 2006, 22:45

Sorry to hear about the recent failures - I heard the Rover 200 Coupe race cars had shaft difficulties, but I thought the Marlin being that much lighter might be a bit softer on the shafts........ although the angle can't help.

Are all turbo builders experiencing failure at the gearbox end, or are there instances of the outer CV packing up as a result of the input angle?

tomboysexi · #4 9th September 2006, 07:16

Hi Guys,

Yes it is odd how the shaft always pulls out at the 'box' end. Jon (Limpabit has just pulled his long driveshaft for the first time. He and I recently spent an hour or two discussing the options. I really do not mind lashing out on these items, since starting my build I guess I have spent around £500. But enough is enough and now I want one that is going to do the job permanently.

As far as it goes, a friend has added 20mm on to my short driveshaft, the join looks good but we'll have to see what happens when it tries to handle the power. The good news is if it works we will at last have a difinitive answer to the problem.

If this shaft does not pull out, I intend to ask one of the specialist manufacturers to make one of this size.

Regards

Trev

limpabit · #5 9th September 2006, 07:41

Hi everyone.

I've been scratching heads with Trev and John (Marlin Turbo).

There's 1 difference between mine and Trev's. I have tilted my engine (found out the MGf also has it's engine tilted). It might mean different configurations for dfferenyt builders. John (Marlin turbo) said Turbo long shaft and diesel short shaft. But as mine has pulled, it looks like I will need the diesel lomg shaft (as this is a bit longer) for my configuration. Can't tell about the short one as Trev said (not sure which one John's got problems with) as this happens when turning left only. But as it stands, the longer of the two shorter ones, Trev's got problems with.

So as Trev's getting his extended, does the 600 or 800 have longer short driveshafts than the 200/400 models?

holgate86 · #6 9th September 2006, 21:36

If you read all the posts on driveshafts it changes direction constantly on the best setup.
I understood that the turbo model used 220 driveshafts, turbo or normally aspirated are the same I think.
I had a problem in the early stages of the long shaft popping out of the inner joint, the cure was thought to be to fit a longer shaft (diesel). This cured the popping out but the real problem was I needed to move the engine further to the right. I only found this problem out after breaking the left hand cv outer cage during hard cornering. The problem is if you fit the longer diesel shaft on the right it tightens the angle of the left hand shaft which is already at it's limit. If it requires modifying engine mounts to move engine across further then do it. I have about 10mm clearance between timing cover and chassis rail and I might even try and reduce this even further.
I also have a stabiliser rod from gearbox to chassis to prevent engine rotating too much and straining the shafts even more.
I still have a problem in that an annoying vibration at 25-35mph under load, I am sure this is due to the angle of the short driveshaft but I'm not certain. I think getting the engine location right for the driveshafts is paramount and would advise all builders to make sure that they use the maximum space available to have the engine as far to the right as possible.

Good Luck
Brian

limpabit · #7 10th September 2006, 09:32

Hi Brian.

Exactly as you describe is I think what has happen to Trev. Has diesel long shaft and broke the shorter petrol shaft during cornering.

My shaft has popped using turbo long shaft.

Just taken some measurements. I have 27mm between timing cover and chassis rail. But to move it to 10mm will not happen. I have only 11mm between chassis and alternator pulley wheel. Maybe the alternator is the difference between the 200 and 800? How much clearance have you got at the alternator Brian?