Trumpet curve

[TVRleigh]

yeah there is a guide somewhere on the net; and the 'how to V8 your MGB' book gives exact dimensions. I can find out and PM them to you if you wish (I have the book at home!). IIRC its about 22-25mm total you can remove (trumpet base and manifold combined). And yes the fuel rail gets in the way if you go any lower.

Personally, I've not reduced my inlet manifold or trumpet base, mainly because its a pain and i can't afford to, but also because I have a spanky ACT carbon plenum sticking out of the bonnet!

If you could PM me. that would be cool.

Or email them too leigh (at) dbm.org.uk

Thanks
Leigh

[Eliot]

The link I had bookmarked for it was:
http://www.mgbv8.co.uk/fuelinjection.htm
But that site seems to have gone now. From memory, he machined the base down underneath, shortened the trumpets and even managed to take a little from the plenum lid to get a decent drop.

EDIT:
You can still read the text of the conversion using the wayback machine (I love that site - not many people know about it)

http://web.archive.org/web/*/http://www ... ection.htm

Sorry, cant format any better. Just past the top url into the search box.


Did find this though:
http://www.britishv8.org/Articles/Rover ... re-EFI.htm[/url]

[TVRleigh]

Thank you Eliot.

I'll let you know how I get on.

[chodjinn]

I hadn't forgotten, just a bit slow, but eliot beat me to it anyway. Yeah let us know how it goes.

[Wotland]

Hy,
during last 4.6 I rebuilt I used TVR 500 trumpet base with SC Power Bell mouth trumpet kit

Outside trumpets were more shortened than middle for an better harmonic. I followed SC Power fitting instruction.

It is me who used the first Eliots trumpet base (the blue one) on supercharged RV8.
I don't have dyno test but on my supercharged engine but I noticed it revs more freely and better throttle response (Sprintex EFi kit).
Before eliot T-Base I used standard TVR 500 T-Base.

[ppyvabw]

At the end of the day though, anyone even considering spending £345 on carbon trumpets needs a punch in the face!

For what gains you will get.

Tvr used 'trumpets' that were just straight pieces of what looked like exhaust pipe , no flare on the at all.

On my custom manifold I'm making at the moment, I made a wooden former, took some exhaust pipe and curved the end over with a ball pein hammer. Then polished them up with the die grinder to remove the hammering marks. Whether they are any good remains to be seen. My dad read an article where they experimented with different shape trumpets and it made no difference, but the way I made mine wasn't very scientific. They are a bit cock eyed too