Single point injection carb replacement

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Paul H
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Re: Single point injection carb replacement

Post by Paul H » Mon Oct 02, 2017 2:41 pm

Yes they are selling :D

Here

If you are in USA then contact me first as the shipping calc in the store is way high and VAT is deducted

Should have a turbo attachment with secondary injector and dump valve built in real soon
Last edited by Paul H on Mon Dec 04, 2017 5:38 am, edited 1 time in total.
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Lanner
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Re: Single point injection carb replacement

Post by Lanner » Tue Oct 03, 2017 3:53 pm

Thanks Paul. Does the TB have provisions for MAP sensor?
Lanner

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Paul H
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Re: Single point injection carb replacement

Post by Paul H » Wed Oct 04, 2017 4:12 am

You just use the port on the OEM manifold or there is a boss on the TB you can drill/tap to 1/8th npt and use an adapter
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Wally
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Re: Single point injection carb replacement

Post by Wally » Sat Nov 04, 2017 3:56 pm

Very nice new development Paul!
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Paul H
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Re: Single point injection carb replacement

Post by Paul H » Wed Nov 29, 2017 11:14 am

Wally wrote:
Sat Nov 04, 2017 3:56 pm
Very nice new development Paul!
Thanks
Here's a couple of pics of the plenum with extra injector and dump valve which I won't be able to supply -cheaper to make your own but you can
see how it can be done.
I had the stainless turbo headers modified so they accept the cheap "ting tong" turbos
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Clonebug
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Re: Single point injection carb replacement

Post by Clonebug » Sun Dec 03, 2017 6:37 pm

I take it you use the DTA ECU to run that single injector setup.

Does Megasquirt have the ability to do that????
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Piledriver
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Re: Single point injection carb replacement

Post by Piledriver » Sun Dec 03, 2017 9:58 pm

Clonebug wrote:
Sun Dec 03, 2017 6:37 pm
I take it you use the DTA ECU to run that single injector setup.

Does Megasquirt have the ability to do that????
std and extra ms 1/2/3 yes, its just a TBI setup, supported since ~dirt.
microsquirt needs high z injectors or external driver for low z.
Typically TBI injectors are lowZ, but I'm not sure what he's using...
Its possible some of the newer TBI injectors are high Z.

TBI is easy to do, but never suggested for highly tuned engines for the exact same reasons centermount carbs are never recommended: fuel fall out and uneven fuel distribution.
(basically huge AFR differences hole to hole)
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Paul H
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Re: Single point injection carb replacement

Post by Paul H » Mon Dec 04, 2017 5:09 am

You can use any ECU to run that system and high z injectors upto 80lb/hr (140hp each) are readily available.I've changed down to a 60 lb/hr as maximum hp through the end castings is 100hp/5000rpm so that would be 1776/1904cc, engle 100/110, stockish heads.Anymore than this just fit ITB's but bear in mind that tuning smaller engines with heads and cams up into the 130hp and above 5000rpm is pretty pointless as the stock fan setup will rob your power almost as fast as you can make it
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Wally
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Re: Single point injection carb replacement

Post by Wally » Mon Dec 04, 2017 5:36 am

Paul H wrote:
Mon Dec 04, 2017 5:09 am
...above 5000rpm is pretty pointless as the stock fan setup will rob your power almost as fast as you can make it
:lol:

As seen when engines on dyno also do a run without the belt on.
Its still pretty funny to express it like that me thinks, but Paul is notorious to tell it the way it is...

Still, my own recent development of the 2,2 turbo engine made max.hp at a real 7300 RPM. It was the higest max RPM at max hp reading at that dyno to date 8)

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Paul H
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Re: Single point injection carb replacement

Post by Paul H » Mon Dec 04, 2017 6:31 am

Yes fan belt hp loss needs to measured across the whole rpm range and not just quoted as a +/- number at peak power.
If you have a 300hp turbo motor then a 25hp loss is no big deal but on a smaller NA motor then it is a substantial loss
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Wally
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Re: Single point injection carb replacement

Post by Wally » Mon Dec 04, 2017 6:56 am

Paul H wrote:
Mon Dec 04, 2017 6:31 am
Yes fan belt hp loss needs to measured across the whole rpm range and not just quoted as a +/- number at peak power.
If you have a 300hp turbo motor then a 25hp loss is no big deal but on a smaller NA motor then it is a substantial loss
That was my new engine, but dyno'd in N/A mode with fan belt on. It was even the horizontal (Porsche style) fan set-up with 90 degree belt arrangement ;-)
Only made 189 hp at 7300 RPM, but its low compression to be turbo'd later this year.

I agree though, fan belt loss is an absolute number per set-up and progressively higher with rising RPM.

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Piledriver
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Re: Single point injection carb replacement

Post by Piledriver » Mon Dec 04, 2017 10:44 pm

The Corvair racers used several tricks to counter the fan losses...

One setup added a disk under the pulley that restricted the air intake at high RPM, but had little effect at low RPM.
Second, they sprayed the belt with silicone lube so it world slip far more at high RPMs.

Yet another setup used an AC compressor clutch on the crank pulley.
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Paul H
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Re: Single point injection carb replacement

Post by Paul H » Tue Dec 05, 2017 3:41 am

The VW T1 cooling was designed for 5k max which is clear as day once you do dyno tests so best to keep it there and build an engine that works best up to that limit above that use a smaller crank pulley.I think Porsche cooling is slightly more efficient but I never tested that system
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