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| Any interest in a dedicated TBI intake? https://slantsix.org/forum/viewtopic.php?t=56284 |
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| Author: | CNC-Dude [ Fri Sep 26, 2014 3:15 pm ] |
| Post subject: | Any interest in a dedicated TBI intake? |
I am making some for other engines and have seen a couple of guys here mention wanting to convert over to this type of induction as opposed to strictly an EFI setup. Just wondering..... |
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| Author: | Pierre [ Fri Sep 26, 2014 11:01 pm ] |
| Post subject: | |
Unless final sale price is less then a clifford or offy it may not be worth it. TBI adapters can be made pretty easily for them. Infact Howell makes a gm tbi > holley 4bbl adapter you can re-drill. |
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| Author: | CNC-Dude [ Fri Sep 26, 2014 11:41 pm ] |
| Post subject: | |
I thought I would make a bolt on TBI plate specifically for the Cliffords and Offy intakes to replace the original carb plate for those intakes, and it wouldn't be an adapter on top of an another adapter kind of setup. And if enough interest grew, then an actual intake for a TBI maybe made. But if everyone that is interested is fine with the bolt on plate, then I can just keep making those. |
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| Author: | Pierre [ Sat Sep 27, 2014 12:25 am ] |
| Post subject: | |
It won't be 2 adapters. The holley 4bbl to GM tbi adapter can be redrilled to accept the Clifford pattern. Use flush mount screws and your set. The unused holley pattern holes can be used to mount a cable linkage bracket. This is the adapter I'm talking about. |
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| Author: | CNC-Dude [ Sat Sep 27, 2014 1:20 am ] |
| Post subject: | |
I have a much better design in mind that has a machined underside to maximize airflow and blends the 2 different shapes together. It will be a little taller also. |
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| Author: | Dart270 [ Sat Sep 27, 2014 3:10 am ] |
| Post subject: | |
I would suggest spending your time and energy on something that cannot easily be made by most people at home with a flat piece of aluminum plate. Just my 2 cents... Lou |
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| Author: | Pierre [ Sat Sep 27, 2014 11:36 am ] |
| Post subject: | |
Yep, that's the point I was going for Lou. |
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| Author: | CNC-Dude [ Sat Sep 27, 2014 4:00 pm ] |
| Post subject: | |
One flaw that isn't obvious with that idea of using the adapter in the kit above in the link and in most others on the market is that on a Clifford intake, the plenum opening is too short(not wide enough) in either direction and causes the throttle bores of the TBI to overhang them by close to an inch on either side. This will cause a serious shrouding of incoming airflow with the design shown, even with the smaller GM TBI unit and probably not allow the user to enjoy what this conversion could really benefit them unless they have a better designed one. Also, why would want to pay $95 bucks for one of those, even if it didn't have this issue and have to modify it when a properly designed one will bolt on without having to that. Plus probably be less money as well. |
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| Author: | Reed [ Sat Sep 27, 2014 4:29 pm ] |
| Post subject: | |
I would rather spend the money on a service to install injector bungs in my intake and a fuel rail. |
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| Author: | CNC-Dude [ Sat Sep 27, 2014 5:37 pm ] |
| Post subject: | |
Reed, do you think that an EFI setup like your describing is better than a TBI setup? |
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| Author: | Reed [ Sat Sep 27, 2014 7:34 pm ] |
| Post subject: | |
MPFI is better than TBI. My planned FI system uses a MAF sensor and is a true multi-point sequential injection system. TBI is the equivalent of a well tuned carb. There are still the manifold heating and fuel distribution problems of a wet manifold. In my view, TBI is a band-aid half-way step between a carb and a true fuel inection system. If I am going to go through the trouble of switching to fuel injection, I would rather go all the way to a true MPFI sequential system. MPDI is much more accurate and can give better economy, power, and emmissions. |
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| Author: | CNC-Dude [ Sat Sep 27, 2014 8:54 pm ] |
| Post subject: | |
Ok, makes sense! Thanks. |
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| Author: | Dart270 [ Sun Sep 28, 2014 4:16 am ] |
| Post subject: | |
Here's my experience: I have been using a flat 1/2" alum plate with a 670 CFM 2 bbl Holley TBI bolted to a Clifford 4V intake for 13 yrs and have made between 240-270 crank HP with this setup. Yes, it could probably be better, but I doubt this "step" is a major restriction. I am about to switch to MP-EFI to improve over TBI. Lou |
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| Author: | Tim Keith [ Sun Sep 28, 2014 7:39 pm ] |
| Post subject: | |
I have the Offy 2 x 1 that I want to use with dual TBI. The throat of the S10 TBI from an Iron Duke is the same size as the Offy, but the bolt pattern is different. Attach a plate to each of the TBI units, then another set of plates to the Offy, then sandwich them together. |
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| Author: | CNC-Dude [ Sun Sep 28, 2014 8:28 pm ] |
| Post subject: | |
You don't really need two separate plates, just one with both bolt patterns in it. I've done those before for some Cheby guys and they work good, so you should have good luck with them. |
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