Intake Trumpets

[griffdude]

Just doing a little 'tweak' as recommended by an F1 engineer friend of mine which involved splitting the plenum. Only to find that 7 of the trumpets were rolling around in the casing which explains the reluctance to rev 5000+ & recent poor rolling road test. Anyone else come across the same/ recommend an adhesive to stop tumpets going AWOL again?

[HarryW]

Not sure what 'glue' to use Tim at ACT could probably advise on that, possibily any high temp silicon sealant/adhesive (IMHO).
More to the point what is this 'tip' from the F1 guy .

Harry

[GreenV8S]

As I understand it from *my* friendly F1 engineer the trumpets are supposed to be an interference fit in the trumpet base and you normally have to heat the base to fit and release them.

[simpo two]

GreenV8S said:

you normally have to heat the base to fit and release them.

As the bases get rather toasty in normal use perhaps that explains why they fell out?! Loose trumpets, bump in the road - and ker-pling, 8 trumpets all flying about....

[RichB]

griffdude said:

Just doing a little 'tweak' as recommended by an F1 engineer friend of mine which involved splitting the plenum.

Won't splitting the pleanum allow air to leak in? Rich...

[Apache]

RichB said:

griffdude said: Just doing a little 'tweak' as recommended by an F1 engineer friend of mine which involved splitting the plenum. Won't splitting the pleanum allow air to leak in? Rich...

you forgot the smiley rich

griffdude, bin em and get some carbon jobs, I happen to know that V8 Developments have a second hand set

[joospeed]

ah but that costs money, I happen to know griffdude's as tight as a ....
sorry "dude"

see u at the quiz

but to answer the question, i use a loctite shaft locking agent .. can't remember the number tho. any loctite type thread lock should do it i would have thought ...

[Guillotine]

araldite do a +200 degree adheasive...'bout £4-00 from RS Components.

that should do it.

[anonymous-user]

griffdude said:

Just doing a little 'tweak' as recommended by an F1 engineer friend of mine which involved splitting the plenum.

That would be the same as one of those double/triple(any takers on quad? ACT?) plenum thingys wouldn't it?

[griffdude]

The car's back together. I'm not sure if simply locating the trumpets correctly or the modification itself(prob both), but the car is transformed. The engine is really revvy, the power is soooo noticeable in the higher gears. Best £20 I ever spent.

[HarryW]

Well, glad you got the trumpets back in are they just rammed in of affixed , you still haven't said what the little mod that was also done .
I would be pleasantly surprised if £20 could make a noticeable difference, pray tell, I'm on the way to garage as we speak .

Harry

[joospeed]

back on the rollers then Howard?

[2 sheds]

HarryW said:

, you still haven't said what the little mod that was also done . I would be pleasantly surprised if £20 could make a noticeable difference, pray tell, I'm on the way to garage as we speak . Harry

You can cut the trumpets down for a bit more "top end" engines like 4.3 and 4.5 would respond to this.
This would be the first/ most obvious tweek. not going to make a huge difference though.

Tim

[HarryW]

Cheers Tim......I was thinking along the lines of putting a gasket thingy in to raise the plenum cover above the trumpets a bit more or somesuch.
I would imagine cutting the trumpets is fraught I assume it is done to get a bit more 'headroom' for them to draw the air down . Isn't there a theoretical ratio between bore of the trumpets and 'headroom' :confusd:.
I also assume that all this is based on sub 5ltr cars only, as they actually have trumpets and not sections of exhaust as fitted to the 5ltr , which really would benefit from 'proper' flared trumpets, ali or carbon, in the first instance.

Harry