Doof

Cheers Andy I wondered about flywheel (as I have changed it to the lightened kit from GBS), however, Troy at Northampton Motorsport said he would have also expected to experience issues with the clutch if this was the case, yet that all behaved fine. Regards Geoff

Cheers Andi Yes, wheel get wheels/tyres checked first as most of you have suggested including Troy at Northampton Motorsport, however, he qualified this by saying in his experience of many 100's of tests, he did feel it was likely to be conflicting gearbox/prop/diff planes/angles that were likely to be causing it! Regards Geoff

Hi Leslie Speed rather than RPM so mid to top end in fourth upwards (probably 90mph+ The engine if off-centre by 5mm. Regards Geoff

Many thanks Alan I had planned a nut and bolt check, with the car having now covered just over 100 miles, but will also work through the other checks you have suggested (not sure how easy it will be to get the prop out - MT75). Fingers crossed something will reveal itself via a process of elimination! Kind regards Geoff

I have had my GBS Zero (Ford) dyno tuned by Northampton Motorsport today and they alerted me to a bad vibration in the car which may point to drive train issues - possible gearbox/prop/diff/drive shafts alignment or balance problems. Apparently, it behaved pretty badly at the top end (clearly, speeds greater than I have taken it on the road thus far since my late Nov. 2020 IVA pass and thanks to Covid, weather etc.) Has anyone any experience at where I might start my investigation first? I know my engine is a few mm off centre in the chassis (checked this out with GBS during the build) and I feeI I have been really spot on with everything, believing (perhaps naively), that the prop shaft Universal Joints would deal with minor angle/phasing differences between the gearbox and the diff. Would appreciate any wisdom please as I am just feeling a little frustrated when my hopes were that I could finally get to drive the flipping thing rather than have to take it all apart again!!! Thanks in advance.

Many thanks. I have managed to get it fitted (probably temporarily) with an extra exhaust flange and extra gasket between the manifold and the engine.

Many thanks for replying

I thought this might be part of the problem but having put a spirit level across the bottom of the raceline sump it is pretty level with there only being 1mm difference on my vernier (between the level and the chassis) from the left side to the right side.

Another quick question - can the rear diffuser be fitted to the car for the IVA test?

Hmmm - mine just wont fit even when I rotate the silencer to the optimum position. I just can't see why just being a few mm off centre that this should throw out my silencer position by that much! If you are achieving 10mm then I would have thought I would get a gap of 5/6mm yet I can't even slide the two bits together because it is so hard against the body!!

Many thanks for confirming.

I did speak with them and this same point was raised - everything checks out but I couldn't really obtain any points of reference i.e. the 'normal' gap between the manifold and the bodywork and/or the 'normal' gap between the silencer and the bodywork! The conversation kept reverting to my engine being a few mm off centre. Are you able to confirm the approx. gaps I should be getting?

Another quick question, having run my engine for the first time just a couple of hours ago - which was a BIG moment and all seemed okay, apart from it being a bit noisy due to manifold/silencer issues. My fan is front mounted to the radiator and it seems to be 'pulling' air from the engine out towards the grille when my feeling is it should be doing the opposite! Could anyone online please confirm. Thanks in advance

Sorry to be a pain but I have faced more challenges today ahead of (trying) to get my car ready for IVA in just over a week! Can anyone confirm how close the silencer sits to the side of the bodywork? I am currently unable to fit mine onto the manifold (done up tight to the engine) because it is touching the bodywork to the point that the two bits cannot be aligned. I know my engine is sitting a few mm off centre to the chassis but it surely cannot be that close. Thanks in advance of anyone's thoughts/comments.