7 replies to this topic

[welshdan]

hi, i can get one of these for a couple of quid from a mate. only other mods are the restrictor is cut down, allowing the butterfly to open to 90 degrees,tightened throttle linkage, k and n induction and a different backbox.

would fitting an alloy 48mm throttle body in place of the plastic 48mm be benificial? or a complete waste of time?

cant see how it would improve anything, but mini suppiers sell them for a simular price to the 52mm alloy ones


if anyone can share advice or experience on this matter it would be apreciated.


cheers

[miniboo]

this is Sprockets reply from Turbominis:

ally better than plastic.

48mm throttle better than 52mm throttle, unless you have a fire breathing engine and even then it doesnt really make much difference.

Now to add my bit.

The plastic throttle bodies are prone to cracking so if yours is cracked and causing a problem then yes get an ally one. if it is ok then i would leave it for now. i doubt the re is any benefit from changin it if it isnt broken.

[welshdan]

hi, yes i asked the question in turbominis first, as that is the forum i mainly use. am building a turbocharged '63 saloon, but have a 98 coopersport for every day driving.i asked here as i know this forum has an injection specific area. i resprayed the cooper and restored it to original about 3 months ago. just looking for ways that i can possibly get a little more performance for cheap.

was just wondering in what respect is the alloy tb better than the plastic?


many thanks

[miniboo]

From my first post


The plastic throttle bodies are prone to cracking

[Cian 'the pain' MPI]

i would go for the 52mm alloy throttle body, i put one in mine and unlike miniboos post IT DOES give a noticiblie performance increase, and the 52mm throttle body is only a few pounds dearer

[welshdan]

i can get an alloy 48mm one for 5 quid from a mate...

[v21ash]

The plastic throttle bodies are not prone to cracking they are prone to warping due to heat etc, causing the butterfly not to seat on idle which obviously causes high or erratic idling.
The same happened on k series engines which is why rover eventually started fitting alloy one's to cure this problem, the 48mm alloy is supposed to be a direct replacement for a warped plastic one, a 52mm is again a direct replacement but in addition give improved airflow. I have a 52mm alloy one on mine and it does give very very slightly better throttle response but that's it.
If you can get an alloy one for £5 I would say go for it, don't expect it to be any different to a plastic one but at least it's worth it knowing it's not going to warp.

Edited by v21ash, 27 October 2008 - 08:23 PM.

[iansmini]

hi, yes i asked the question in turbominis first, as that is the forum i mainly use. am building a turbocharged '63 saloon, but have a 98 coopersport for every day driving.i asked here as i know this forum has an injection specific area. i resprayed the cooper and restored it to original about 3 months ago. just looking for ways that i can possibly get a little more performance for cheap.

was just wondering in what respect is the alloy tb better than the plastic?


many thanks

If your looking for performance it has been proven that longer throttle bodies don't make any difference as a performance upgrade, Sprocket, minispares and miniboo has pointed this out many of times on this forum. I can't remember the correct science but if you search through sprockets posts you'll find it there.