Triumph ITB - AEM Infinity Project

[Clay.0]

Merry Christmas guys and gals

[Pehlen]

Great pic, great looking car.

[al lkosmal]

looking good clay..merry xmas.

[David Borden]

Super impressive project Clay! Those manifolds are a thing of beauty and your execution is just incredible!

Ive been debating building manifolds for the Triumph ITBs as well. Yours look great and would save a great deal of time.

Does anyone feel there any issue with the lengths of the two outside runners compared to the center one?

[merlinfe]

Originally Posted by David Borden

Super impressive project Clay! Those manifolds are a thing of beauty and your execution is just incredible!

Ive been debating building manifolds for the Triumph ITBs as well. Yours look great and would save a great deal of time.

Does anyone feel there any issue with the lengths of the two outside runners compared to the center one?

If anyone does have a problem, they also have a problem with Weber Manifolds, and Zeniths, and PMOs. Pretty much all the same proven design.

-Steve

[r-mm]

Very nice work. Can I ask why you are using weatheproof type connectors - is the new fuse panel inside or outside the cabin?

[Clay.0]

The fuse panel is in the cabin and the bussman panel comes with weatherproof connectors so I got more for the other plugs as they used the same terminals and tools. I ordered a bunch for other projects. They are not required.

[lvporschepilot]

You get this rig on the dyno yet? What are the other specs for this little powertrain? Love the work!

[quattrorunner]

I love your car....I really love it so much I feel like I need to go smack something...what does that mean? Am I ok?

[quint22cp]

Originally Posted by merlinfe

If anyone does have a problem, they also have a problem with Weber Manifolds, and Zeniths, and PMOs. Pretty much all the same proven design.

-Steve

Hi Merlin,

This is exactly what I have been obsessing about when I set out to do my Triumph ITB conversion. From the pic you can see that I chose to have the straightest possible ports and also reasonably short so that the injectors still hit the back of the valve.
The heavy looking aluminium plate serves two purposes, it keeps everything rigid and it is internally drilled for brake vacuum and fuel regulator vacuum take offs. I intend to machine some of it away to lighten it later on.
I am currently working on the linkage between the ITBs.

Great work Clay you have been an inspiration to me to get mine finished. Look forward to another instalment.

Pete

[al lkosmal]

Pete,
Interesting approach regarding the adaptor plate. I also designed an adaptor plate to mate the Triumph ITBs to Weber manifolds..........similar to your approach, but not a straight shot. Also, I just used the vacuum ports built into the Triumph throttle bodies.





Also, you might want to research the effects of runner length........basically short runner length is good for top end power....long runner length for low end power........I have some reference material that i used when I designed my EFI kit......if i can locate it I'll post it....but googling will likely find good info.

regards,
al

[quint22cp]

Hi Al,

Interesting, there must be more Triumph ITBs on Porsche's than there are on Triumph motorcycles, everyone has got one or should that be 6.

I know what you're saying regarding runner length, I am aiming to use long trumpets atop the ITBs for a ram effect. The vac' ports in the Triumph bodies will be used for the idle valve connection as they were on the original motorcycle. What injectors are you using ?
I am going to measure the Triumph ones to see what they will flow. I think I need somewhere around 28 - 30 lb.

I must admit I got a bit obsessed about the straight runners. My thoughts were that on the original motorcycle they were a straight shot and the injectors were close to the valves as in the Porsche manifold. It sort of evolved from what you have at your disposal. When I started this project (some years ago) I didn't have 3D printing facilities as, Clay did, but where I was working at the time they had full workshop facilities and some excellent aluminium welders. Hence the fabricated approach.

Reading through Clay's project has given me the kick up the ar*e to get this project finished and on the car before summer.

I am currently working on the linkage between the ITBs, I have managed to come up with a simple solution using the original Triumph parts and a few other odd bits off ebay. I should have this working tomorrow so I will post another pic.

Pete

[Clay.0]

Originally Posted by quint22cp

Great work Clay you have been an inspiration to me to get mine finished. Look forward to another installment.

Thanks!

Originally Posted by quint22cp

I am currently working on the linkage between the ITBs, I have managed to come up with a simple solution using the original Triumph parts and a few other odd bits off ebay. I should have this working tomorrow so I will post another pic.

Pete

I've been thinking about trying out a center push/pull linkage setup off the Triumph linkage to gain a little more clearance on the air filters, it's tight now there's limited room for adjustment. I really just need to play with it more. Feel free to share what you've come up with.

[al lkosmal]

Pete,
Here is a list of Triumph injector specs.



regards,
al

[quint22cp]

Hi Clay,
Here's a pic with the ITBs linked together. I used a piece of brass tubing to bridge between the spindles of one ITB to the next and then filed out the original Triumph parts to fit over the tube. I then brazed it all together, needs cleaning and painting (maybe zinc plating) but it works well and I have now done all 6 ITBs. Not sure what to do about ram pipes and air filters yet. I saw how you did it with the Triumph rubber parts and that maybe the way I go. Also thinking about making something up in plastic (i.e. like 993) or how about sand casting some trumpets and machining these up. Lots of ideas still working on it.
I have decided to stick with the original Triumph methods and I'm going operate both banks of ITBs with cables to a common crank. I looked at all those ball joints and linkages and thought "looks good but that's a lot to adjust and cables are just so much cleaner".

Thanks for the injector table Al.
I have 6 of the 1240891, I flow checked them and they will do 300cc/min (30lbs) if I nudge the fuel pressure up to 45psi. They spray really well with good atomization much better than my current ones at 36psi. As the injector pitch is still standard I going to use the original Porsche fuel rails bolted to the Triumph fuel rail bracket.
Regards Pete

[Tremelune]

I'm surprised there isn't a bolt-on ITB/EFI kit for these cars yet. If it was even remotely reasonable in cost (which might not be too hard to accomplish, based on the price of stock parts), I think they'd wind up on a significant portion of these motors.

[Ryan H]

Originally Posted by Tremelune

I'm surprised there isn't a bolt-on ITB/EFI kit for these cars yet. If it was even remotely reasonable in cost (which might not be too hard to accomplish, based on the price of stock parts), I think they'd wind up on a significant portion of these motors.

Al's (X-Faktor) kit is bolt-on and he's always around if you need support.

I think there are a bunch of ITB cars being built as we speak. I am one of them.

[Tremelune]

EFI Kit S3-EFI-001

Nice, thanks!

What, no 3.6-3.8??

[Ryan H]

Originally Posted by Tremelune

EFI Kit S3-EFI-001

Nice, thanks!

What, no 3.6-3.8??

Those 3.6 and 3.8 guys are are too busy going to cars and coffee

[al lkosmal]

The Triumph t-bodies are approx 42mm. For larger engines I typically use larger t-bodies from PMO...and i am currently working with RHD (Austrailian company) to bring their EFI products into the 911 EFI world. They currently have 40-45mm t-bodies and are working on larger sizes. These should be on my website soon. I'm in the middle of the design review for the 1st beta test units, as we speak........stay tuned.

regards,
al