Where do I buy 120mm trumpets from?

[Martin.]

Hmmm I see yeah. Would that fit within the filer housing though? Mine is literally pushing onto the bonnet as it is and have no space to push that further out.

 

[fake ben taylor]

I'd still spend the extra on the tapered Jenvey ones

What's the point on scrimping on a £2k throttle body setup?

Because its been proven that tapered trumpets doesnt add anything and after that a bit of spun ally with a flared/rolled end is just that?

I agree with not scrimping but theres times when you get what you pay for and theres times where a bit of common sense can save you quite a bit of unnecessary expense.

 

[Chip-mk1]

Hmmm I see yeah. Would that fit within the filer housing though? Mine is literally pushing onto the bonnet as it is and have no space to push that further out.

You can put them between the trumpets and the backplate if you have enough space, and if you dont have then you cant fit 120mm trumpets anyway.

 

[Martin.]

You can put them between the trumpets and the backplate if you have enough space, and if you dont have then you cant fit 120mm trumpets anyway.

Cool. I have more than enough space for 120mm trumpets in the filter housing. Just wasn't sure how the connections would work with the backing plate in the way etc.

How much do these spacers cost roughly? Don't look as nice as bigger trumpets though..

 

[Chip-mk1]

Bit dearer than the trumpets, unless you are putting them before the bodies (which it sounds like you cant) then I would just go trumpets instead personally.

 

[neil a]

These are the spacers I have fitted justnow.
They fit inline with the trumpets. I originally bought them to fit behind a flat backing plate to give fuel rail clearance but then bought a deep backing plate so fitted them inside.

 

[Martin.]

These are the spacers I have fitted justnow.
They fit inline with the trumpets. I originally bought them to fit behind a flat backing plate to give fuel rail clearance but then bought a deep backing plate so fitted them inside.

Mine would have to go inside the backing plate too.

How much did they cost?

Probably just going to buy the Jenvey 120mm trumpets today or tomorrow.

 

[neil a]

I bought them second hand off of eBay for £50 I think, I got 60mm trumpets with my bodies so fitted these aswell giving me around 85mm but going to 120mm now.

 

[MG cup]

What's the bore of them Neil, I have just had a cracking idea, hopefully it works. Will end up with 145m trumpet and the bodies themselves will be 65 mm further from the engine.

Anyone think that's too big? Chip? Going too big kill the BHP?

 

[Cup_Phil]

Because its been proven that tapered trumpets doesnt add anything and after that a bit of spun ally with a flared/rolled end is just that?

I agree with not scrimping but theres times when you get what you pay for and theres times where a bit of common sense can save you quite a bit of unnecessary expense.

You say they don't add anything based on a test by the company that make the non tapered ones. Not based on the studies made by every other company.

We have found that the use of a taper that continues the shape of the ram pipe right through the throttle & manifold up to the valve, has improved torque through almost the entire power band.

The peak BHP that we have seen from the tapers with butterflies is better than we have achieved in similar tests using parallel bodies, barrel throttle bodies or a slide throttle assembly.

We can all quote things off the internet but at the end of the day I'd rather have what Jenvey recommend for the Jenvey bodies - I'm sure they don't throw thousands into flow testing just to ignore the results.

 

[fake ben taylor]

You say they don't add anything based on a test by the company that make the non tapered ones. Not based on the studies made by every other company.

We can all quote things off the internet but at the end of the day I'd rather have what Jenvey recommend for the Jenvey bodies - I'm sure they don't throw thousands into flow testing just to ignore the results.

Im not throwing around quotes off of the internet though. Im going off of people who were there and saw the testing telling me it makes no real world difference. and the development of the adjustable ones came after seeing that tapered trumpets dont add anything - so i doubt its all made up to sell a product tbh

 

[Cup_Phil]

It was a test by someone at that company on a single engine which led to them selling a product.

Let's just agree to disagree, I'm happy with my setup

 

[neil a]

They will be 48mm Morgan as they fit flush with my trumpets and body inlet.

 

[MG cup]

They will be 48mm Morgan as they fit flush with my trumpets and body inlet.

Perfect.

 

[Martin.]

It was a test by someone at that company on a single engine which led to them selling a product.

Let's just agree to disagree, I'm happy with my setup

You buy yours direct mate?

These are the exact ones, right? Or do I still need to check any measurements, holes align etc? Sure you said they were 45mm standard?

http://www.jenvey.co.uk/home/access.../jenvey-dynamics/air-horn-48mm-x-120-ah48x120

 

[MG cup]

You buy yours direct mate?

These are the exact ones, right? Or do I still need to check any measurements, holes align etc? Sure you said they were 45mm standard?

http://www.jenvey.co.uk/home/access.../jenvey-dynamics/air-horn-48mm-x-120-ah48x120

Bolt spacing will be alright, just measure the internal diameter of your bodies to be sure.

 

[Cup_Phil]

Aye they should be fine for yours as you've got same as me - but if you want to be doubly sure just whip one of your trumpets off and make sure the ID is 48mm

 

[Martin.]

45mm at the base and 48mm at the tip is what I'm expecting.

 

[Chip-mk1]

What's the bore of them Neil, I have just had a cracking idea, hopefully it works. Will end up with 145m trumpet and the bodies themselves will be 65 mm further from the engine.

Anyone think that's too big? Chip? Going too big kill the BHP?

You mean you want 210mm plus the normal length of TB and inlet?

If so yes I think that will be too long and be likely to hurt top end power slightly, although will give awesome torque.

 

[Chip-mk1]

Im not throwing around quotes off of the internet though. Im going off of people who were there and saw the testing telling me it makes no real world difference. and the development of the adjustable ones came after seeing that tapered trumpets dont add anything - so i doubt its all made up to sell a product tbh

On vauxhall XE engines, the tapered bodies make a few percent more power than parellels typically.

 

[MG cup]

You mean you want 210mm plus the normal length of TB and inlet?

If so yes I think that will be too long and be likely to hurt top end power slightly, although will give awesome torque.

I'm not sure on total runner length but I want to stick 65mm angled spacers before the body's and then trumpet spacers behind the trumpet to essentially make them 145mm trumpets. Then there's the bodies length and the manifolds length.

That sort of length looks more a kin to S1600, S2000 or BTCC engines except it isn't a lovely one piece manifold just pieced together.

 

[Chip-mk1]

Trouble with stuff like that, is too things that look the same, might not be, a slightly different diameter of internal runner can make a big change to the volume of it etc.

Trial and error is only way really, so give it a go, but I would do it in two stages personally rather than all at once.

 

[EVOgone]

Not sure with spacers as they may only work on parallel bodies as tapered ones you would get a taper then parallel then taper?

interesting artical on tapered vs parallel and more importantly induction length on a f4r.

http://www.emeraldm3d.com/articles/mar2012/

 

[fake ben taylor]

Ah yes but that's irrelevant as they just want to sell stuff..........