Jenvey DTH Throttle Bodies

DTA is programmable by yourself tho dude..

 

nice to see the Jenvey DTH bodies flow well in their 45mm guise.
they were originally cast to be 48mm and up, but when I got involved with them & Jenvey to help finish their development and testing (my old Jetta ran the prototypes) I thought for majority of 16v users, 45mm was more than enough for what the 16v vw head can actually flow. (not being a very good head relative to the same era red tops)
Woudl love to see what rebuilding Robts into 48mm would do on an engine which justifies that little extra .

rock & roll

 

Me too, go on Rob, you know it makes sense...

 

when I get my new snick-snick gearbox I may well do this - will be able to get away with a more revvy engine if the gears will take it - have not done this so far as the synchros just wont take any more abuse, marginal as it is

I know for a fact that 48's on a longer DCOE-type manifold will give another 12-15hp on my engine. I dont think the DTH's will give up this much as the injector is much closer to the head but maybe another 10hp with better throttle response than a far away injector

8-injectors is obviously the way to go but thats would need a new ECU etc etc etc and I have better things to spend my dough on right now

 

Just picked up a pair of 48 jenveys for my next project.
Quality of the machined finish in the bores is shocking!
Looks more like a fine thread than a turned surface, and you can see light all around the butterfly even when it's fully closed. Seems they don't need to be so 'finely' finshed as a carb afterall.

 

thats poor - my 45 dth's are very smooth, just as they should be - there should be no light through the butterfly - I would send em back

 

I have SFE's (4 x individual bodies) and the internal machining is excellent.

Sound like they "escaped" a machining process, send em back!

Cheers

Simon

 

Mine arrived the other day !!

DTH Jenvey 45's from Bill.

 

Reject them. That is not acceptable

 

ANyone got a close up pic(using macro) of the bore on their Jenveys? Maybe I'm being a little picky for not having a super smooth bore, while thinking my turned finish isn't good enough.

 

I might have some, I will take a look tomorrow

 

My new ones are polishied fron the trumpet to the butterfly, then after the butterfly to the head not a polished finish.

as you can see on this pic.

 

the butterfly fit described is what i would reject them for

 

I have some more pictures that may help. The area around the butterfly is a turned finish as you mention above - fairly smooth, probably equivalent to 60 grit paper I guess. The transition from round to oval is an "as cast" finish.

Some pics

 

And one more

 

I think the comparison is DCOE style bodies to DTH, where DCOE bodies are turned the whole length

 

Bill

have you got any detailed picture showing the DTH's fitted to the Head, i want to look at the throttle cable details.

 

http://www.badger-5.com/bin/throttle-cable-instructions.pdf

here is a picture of the install.

regards
bill

 

Cheers Badger

 

Great thread guys, learnt more reading this then 1.5 years on a Auto engineering foundation degree! It's awesome how u guys share info, one day hopefully i'll have more to add!

I wish i'd paid more attention to the details when my head was done about 6 years ago. Also a lot of whats described here goes against what I was taught on a work experience placement where we worked on an 8v head - unless crossflow heads work on a different principal?

I've dreamt of throttle bodies for 9 years