Computer controlled flat tappet camshaft (TBI) - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-29-2005, 02:44 PM
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Computer controlled flat tappet camshaft (TBI)

I have off road truck with a v8 350 TBI engine (from pick up truck).

I need advise about this camshaft, is computer compatible?
I see in teh specs that is for a TPI, what about the TBI?

249-12-388-4 Computer controlled flat tappet camshaft
Lift: .425''/.440''
Duration @ .050'': 206°/212°
RPM Range: 1000-5000

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Old 03-29-2005, 10:30 PM
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Quote:
Originally Posted by pirata 4x4
I have off road truck with a v8 350 TBI engine (from pick up truck).

I need advise about this camshaft, is computer compatible?
I see in teh specs that is for a TPI, what about the TBI?

249-12-388-4 Computer controlled flat tappet camshaft
Lift: .425''/.440''
Duration @ .050'': 206°/212°
RPM Range: 1000-5000
This specs is ok, but you need know the LSA.

You can to use a Vortec(L98) and LT1(Corvette) Cam in a TBI without problem if you have only roller lifter . Is very important also in TBI engines the LSA (lobe Separation Angle), that depend if you will re-programer Chip o you will keep it.
The TBI Engines are very sensitive a Idle, for that you have choice a higher LSA (112, 114 for example).

Saludos
Raúl
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Old 03-30-2005, 06:37 AM
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Are you really sure about that, yesterday i spoke wirh Norman White from Affordable Fuel injection, and he told me that the TPI camshaft will not run in a TBI.


The other thing was that you can run any carbureted camshaft with the proper LSA.

What you think


Send me your phone number, tomorrow i´ll be in Antofagasta
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Old 03-30-2005, 08:44 AM
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Quote:
Originally Posted by pirata 4x4
... and he told me that the TPI camshaft will not run in a TBI.
LOL! If that logic holds true, then my TBI cam should not work with a TPI. But I successfully swapped a TPI to my 94' Suburban, that has a stock replacement engine (including cam) for a TBI system.

I agree that the LSA should be at least 112*, preferably 114*. If that cams LSA is min. 112*, it will work fine, but I agree that some tuning will be required. At the very least, probably and slight increase in fuel pressure.

Ed.
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Old 03-30-2005, 12:02 PM
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Sounds like Norman has some learning to do. For the most part, a cam is just a hunk of metal shaped in a certain fashion. The only difference between them being if they are designed for roller or non-roller applications. The FI unit has 0 idea what cam is in the engine. All it knows is incoming air, fuel pulse, throttle position, etc. You could put 16 mice in your engine, and as long as they moved those lifters on time, your FI would never know .

I agree with everything that has been said about the cam specs. However, I have talked with many people running a variety of speced cams (some very wild) with LSA's of 106-110. However, at that point its all in the tuning, and unless you can tune and program your ECM yourself, I would not recommend going that route cam-wise.
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Old 03-31-2005, 07:29 PM
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Might be that the TBI computer isn't calibrated for the hotter TPI cam. The specs I saw for the TBI cams were something like 179* intake duration, so if the computer's set up for that one, a 206* cam might confuse it a bit.
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Old 04-02-2005, 11:01 PM
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Quote:
Originally Posted by jimfulco
Might be that the TBI computer isn't calibrated for the hotter TPI cam. The specs I saw for the TBI cams were something like 179* intake duration, so if the computer's set up for that one, a 206* cam might confuse it a bit.
TBI´s has 194° @ 0.05" Intake of Stock not 179°, then 206° is a good number think.

Regards
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