VTS Inlet Manifolds

16th January 2003, 06:23

Has anyone any thoughts about fitting an additional 4 injectors into the inlet manifold, rather than using just a 5th and/or 6th?

Any ideas on how to make the inlet handle more pressure?

16th January 2003, 06:56

Yes I thought about this.... At one stage I even had a jig made up for a new stainles sinlet manifold... this may now become a project for the future though...

I was thinking about an extra injector on each branch...

I've also though about kevlar wrapping the original manifold too.. as this would give a lot more strength to the plastic body.

Simo'

17th January 2003, 00:11

you can fit another set to underside of inlet manifold .

what boost /bhp are you running or do you want to run and what engine mods have been done so far

17th January 2003, 00:31

I have fitted 4 additional VTS injectors to the underside of one my inlet manifolds and seems to be ok, but it has not been fitted to the engine yet. I too have thought about casing the original manifold in either carbon fibre or Kevlar. What are your thoughts on this route John? I have some pics of my 8 injector manifold.

The engine internals are being machined as we speak. I have forged low compression pistons and will be running only 0.8 bar with a S/C and front mounted I/C. At the moment I think the manifold is the most likely failure when I increase the boost.

17th January 2003, 00:40

I'd be interested to see some pics!!

Either post them here. or email them to me at simon@saxperience.com

Thanks.

17th January 2003, 01:01

the other solution is to fit t/body manifold with either 4 tbodies(which have double injector holders,then a plenim chamber ,or you can have blank t/body castings ,but with double injector holes in them .fit plenim and still use std single t/body and associated electronics ,switches etc. . we have also thought about covering in grp (kevlar is stronger ,but don,t think it necc)the main weak point will be the joint between top and bottom half .If i was wanting to run 1bar or more of boost i would first be paying some attention to air flow ,as the better you make the air flow the less boost required to get power. showing big numbers on a boost gauge is ok ,but if you can get same power just by improving air flow then it will keep stress on engine to a minimum ,make more power (and you can always up the boost after that !!).just whacking up the boost is not the best way ,more boost =more heat ,more heat =more engine problems.so for those wanting mega power have a think about soe of the things you would do to a n/a engine first,if it works without boost ,it must work with boost(only exception is wild cams) Procomp is doing pressure tests on the plenim chamber we use for the t/body set up ,so it can be used for exactly what you are thinking about,results soon. there is a full cast plenim chamber available right now .barry moore has one for his ax/vts /s/c converson,

17th January 2003, 02:15

I have looked into using throttle bodies and was very close to going ahead. The possibility of using a stand alone management seemed very appealing too. However at the moment I can't see a significant performance increase to justify the cost and the time. Its more than likely in the future I will find the money etc and try for the ultimate. I need to get some possible headwork done and do as much as possible before taking the final plunge.

P.S. Simo, I emailed you some pics, let me know what you think and if the images didn't come out!

17th January 2003, 03:23

cost of t/body blanks will be a lot cheaper ,and no linkage etc,as i said look to getting gas in and out bettter to start with

17th January 2003, 06:21

Cheers Alex...

I got the pics. They were a bit distorted and broken though??

It looks good in principal!!!

I have a spare inlet manifold, so I might have a play around too...

Simo'