I suspect that this topic has been discussed before . Has anyone successfully replaced a plastic bodied throttle housing by using an adapted Rover 25 ZR type aluminium one,if so is it easy to do . I know there are new SU bodies available but they are a tad expensive. My MPI Cooper s works is running OK with the plastic one but I thought a little project over the winter might be good .
As always, any thoughts are gratefully received.
John
Twin Point Throttle Body .
Started by
YoungJon
, Dec 10 2021 11:50 AM
5 replies to this topic
#1
YoungJon
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Posted 10 December 2021 - 11:50 AM
#2
cal844
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Crazy About Mini's
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Posted 10 December 2021 - 01:59 PM
Upgrade it to the bigger ally unit on minispares, you'll have no issues then
#3
Steve220
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Posted 10 December 2021 - 05:57 PM
Larger TB doesn't necessarily mean more power... especially on a NASP. Stack velocity is key.
Edited by Steve220, 10 December 2021 - 05:58 PM.
#4
Itsaminithing
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One Carb Or Two?
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Posted 10 December 2021 - 06:23 PM
Not sure that he's only interested in a 52mm.... just a TB that doesn't warp & stick!
Did a conversion myself many years ago using a MGF 48mm alloy body.
Don't remember much apart from that i swapped some parts over, made up a patch lead to reach the TPS (Throttle Position Sensor), & that my throttle cable is in a slightly different place.
It was worth the work just to get rid of that 
plastic thing.
I agree with Steve about sticking with 48mm but as a rough guide to what's involved here's how someone else did it using the MG-ZR 52mm body
http://www.stallard-...an Estate 5.htm
#5
Steve220
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Crazy About Mini's
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Posted 10 December 2021 - 06:37 PM
Not sure that he's only interested in a 52mm.... just a TB that doesn't warp & stick!
Did a conversion myself many years ago using a MGF 48mm alloy body.
Don't remember much apart from that i swapped some parts over, made up a patch lead to reach the TPS (Throttle Position Sensor), & that my throttle cable is in a slightly different place.
It was worth the work just to get rid of that
I agree with Steve about sticking with 48mm but as a rough guide to what's involved here's how someone else did it using the MG-ZR 52mm body
There was an experiment years ago (will try and dig out the link) of back to back tests of different size TBs on the MPi, including using the T16 one. The most power was on a 45mm custom!
#6
YoungJon
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Posted 13 December 2021 - 04:03 PM
Thanks guys for the replies 
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