Twin HS6 on Custom Manifold and Special filters 4 big engine
Discussion
I have a 91 Cooper S Conversion (last year of the carbs). Great car with the 3.44 diff and the Cooper head mods and all the rest that goes with it.
I get Vmax to service and tune it. Recently it had been running crap at the bottom end Stuart Gurr tells me this is the bushes of the twin 1.25" Su' being worn and seeping air in at idle to say 3k revs.
Got this priced up at Minispeed (bot the smaller carbs needed doing at £65 pound each!), then remembered I had some 1.75" one from a TR4 Racer I had (that I had since gone to twin 2" and then twin Webber 50's!), so had these looked at and only one needed rebushing - thought though sod it - let try them. So then spent 2 months getting a manifold from Maniflow (really for racers) and modding it a bit for the road car (brackets and vaccum take off's) - small ram pipes, really tasty Ramair filter kit with no back plate holes (they do not make in this size - so cut all this), finally got back on the car and with needle that were in it seemed fine all through the rev range to 6 but wary of canning in high revs for long and needed setting up and might be lean at the top end.
Finally got Stuart to setup and found were lean at the top (piston belting!) so needles modded, but now a bit lumpy at the bottom end. Goes like a mad thing past 3k! 88bhp at 6k and 92 ft/lbs on the 3.44 diff!
But think they are really for a bigger engined car (that will get the best out of them - just drawing to much ari low down I think for a 1275).
***If there is anyone out there that fancies these - I'll have to add all the bits up and will do in next week or so. Wish I had cash to do a 1380 or bigger to make them work but think I want a later longer final drive MPI that Stuart can Supercharger - So likely get the Cooper S sold when back to std carbs, pity Mega car - Sad day- but to much on. I will be taking the bit set off after Goodwood LSMOC trackday (wednesday) and going back to the 1.25 (have to rebush them after all this!) - few bhp less but alot more driveable.
Will be great at Goodwood though!
I get Vmax to service and tune it. Recently it had been running crap at the bottom end Stuart Gurr tells me this is the bushes of the twin 1.25" Su' being worn and seeping air in at idle to say 3k revs.
Got this priced up at Minispeed (bot the smaller carbs needed doing at £65 pound each!), then remembered I had some 1.75" one from a TR4 Racer I had (that I had since gone to twin 2" and then twin Webber 50's!), so had these looked at and only one needed rebushing - thought though sod it - let try them. So then spent 2 months getting a manifold from Maniflow (really for racers) and modding it a bit for the road car (brackets and vaccum take off's) - small ram pipes, really tasty Ramair filter kit with no back plate holes (they do not make in this size - so cut all this), finally got back on the car and with needle that were in it seemed fine all through the rev range to 6 but wary of canning in high revs for long and needed setting up and might be lean at the top end.
Finally got Stuart to setup and found were lean at the top (piston belting!) so needles modded, but now a bit lumpy at the bottom end. Goes like a mad thing past 3k! 88bhp at 6k and 92 ft/lbs on the 3.44 diff!
But think they are really for a bigger engined car (that will get the best out of them - just drawing to much ari low down I think for a 1275).
***If there is anyone out there that fancies these - I'll have to add all the bits up and will do in next week or so. Wish I had cash to do a 1380 or bigger to make them work but think I want a later longer final drive MPI that Stuart can Supercharger - So likely get the Cooper S sold when back to std carbs, pity Mega car - Sad day- but to much on. I will be taking the bit set off after Goodwood LSMOC trackday (wednesday) and going back to the 1.25 (have to rebush them after all this!) - few bhp less but alot more driveable.
Will be great at Goodwood though!
Wildfire said:
Jon I can get hold of a 1380 engine, sadly one piston is holed but otherwise in good nick. The bores are ok. Very cheap if you want to match you carbs.
Tempting honestly, but I have been told it has to go. Basically it is to loud. Toys out of pram about it - trying to pacify with a low ratio MPi (that will be slow) but later can get Vmax to blow it. That way quite and evenentually fast as well - saw on down there last week with big 48 tyres all one colour - immaculate - 150bhp Late car the ful works. Some art dealers - Absolutely AWSEOME. love machine said:
Have you considered belting up your own Bini charger?
I've written an article about it on the interweb somewhere. There is a better way to skin a cat.
Where? I've written an article about it on the interweb somewhere. There is a better way to skin a cat.
Think a bit late for me know - in the mind set to get one like that Red Beast (missed that edition - see the custom crap in this months one!). Seems to not be running too bad low dwon today - stuart think he can sort it - think I might get some For Sales signs on it for the Goodwood Track Day tomorrow.
So Stu - a lover or a hater orf the Vmax kit?
Well you can't hate it - it works Damned well. Having just been in two at Goodwood and Stuart Wright NUTS Turbo thing (a whole different ball game and not really pracical for the road).
The two Vmax one I had a go in were a 1275 one on a 1.75 SU that made about 135bhp and a 1380 with cam that made 160bhp! Both bloody fantastic - and LOADS of torque - like having a tuned 2litre engine up front just like having a huge big hand pushing you along from behind.
The larger engined one had a heater just down steam of the carb to avoid carb icing - which apparently the other one did suffer from a bit.
They are great on std or tweeked bottom end but all have a larger valved head.
Trouble is they are reasonable cash for the carb carb but really start to get expensive for the full MPI Emerald converted ones (Awesome one in Vmax with 150bhp) - late Cooper all one colour on nice after market deep dish black wheels and tasty interior.
Well you can't hate it - it works Damned well. Having just been in two at Goodwood and Stuart Wright NUTS Turbo thing (a whole different ball game and not really pracical for the road).
The two Vmax one I had a go in were a 1275 one on a 1.75 SU that made about 135bhp and a 1380 with cam that made 160bhp! Both bloody fantastic - and LOADS of torque - like having a tuned 2litre engine up front just like having a huge big hand pushing you along from behind.
The larger engined one had a heater just down steam of the carb to avoid carb icing - which apparently the other one did suffer from a bit.
They are great on std or tweeked bottom end but all have a larger valved head.
Trouble is they are reasonable cash for the carb carb but really start to get expensive for the full MPI Emerald converted ones (Awesome one in Vmax with 150bhp) - late Cooper all one colour on nice after market deep dish black wheels and tasty interior.
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