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DISCUSSION => General Topics => Topic started by: dlmrun2002 on April 11, 2009, 09:16:20 PM

Title: throttle body bore out
Post by: dlmrun2002 on April 11, 2009, 09:16:20 PM

Is there any place  in the States you can send a throttle  body to  to get it bored out a bit to  open up the intake  side? Thanks..
dlm ny

Title: throttle body bore out
Post by: xwill112x on April 11, 2009, 09:33:46 PM

its not needed.

the metric mechanic 2.1L ralley motor makes 250 hp and uses stock throttle body.

EDIT:cone filter setup and you'll be set. ;)

Title: throttle body bore out
Post by: dlmrun2002 on April 12, 2009, 06:43:21 AM

Ok   I'll just  bore my engine out then.  Wny didn't I think of that?
dlm

Title: throttle body bore out
Post by: xwill112x on April 12, 2009, 11:10:18 AM

because that costs a LOT. ;)

Title: throttle body bore out
Post by: dlmrun2002 on April 12, 2009, 05:27:20 PM

I was being  facetious. Poor  orange doesn't look happy.
dlm ny

Title: throttle body bore out
Post by: DaveM-sport on April 12, 2009, 06:00:09 PM

It doesn't make much of if any difference but every little helps too:)

If you want to get it done, any machine shop should be able to do it.

Its just a case of mounting the throttle body on a lathe and boring out by about 3mm
then making up a new butterfly to fit.


I've been getting one or two and an M20 one for a mate ready to work on in the next week or two.

Quote

its not needed.

the metric mechanic 2.1L ralley motor makes 250 hp and uses stock throttle body.

EDIT:cone filter setup and you'll be set.

What? this one?
http://ie.youtube.com/watch?v=MjrKaFgd190&feature=related

To be honest, it seems very slow for what they cost and the power they are suppose to be producing.

Cone filters make no difference whatsover apart from more noise unless used with a decent heatshield too

Title: throttle body bore out
Post by: xwill112x on April 12, 2009, 06:37:18 PM

i believe they help with throttle response, but its no 20hp increase like some companies claim.

Title: throttle body bore out
Post by: tjts1 on April 12, 2009, 06:58:42 PM

The TB isn't the restriction point on these engines. Its already over sized as it is. Start with the 2" bottle neck at the intake muffler and work your way back.

Title: throttle body bore out
Post by: JP 91iS on April 13, 2009, 01:16:15 AM

Try  flow testing your Air Intake  (http://autospeed.com/cms/A_111109/article.html).  It's something I'm curious to see the results of for the M42.  But I think tjts1 is right - most of the restriction comes from there.

Title: throttle body bore out
Post by: sammy on April 13, 2009, 02:29:51 PM

Apparently the throttle body from the M43 from an E36 fits on the M42. There about
6mm bigger than the stock one.          

http://cgi.ebay.com.my/ws/eBayISAPI.dll?ViewItem&item=140026348414

Title: throttle body bore out
Post by: tjts1 on April 13, 2009, 04:45:19 PM

I don't see how that would fit.

Title: throttle body bore out
Post by: xwill112x on April 13, 2009, 06:21:57 PM

why are people so set on changing their TB'??
 spend your cash on a mod thats worth while.