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 Post subject: engine
PostPosted:Tue Jan 07, 2014 5:52 pm 
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Small Block

Joined:Sun Sep 15, 2013 7:06 pm
Posts:21
hi can anyone help me what is the difference between the tbi and the tpi engine


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engine

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 Post subject: Re: engine
PostPosted:Tue Jan 07, 2014 7:51 pm 
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Big Block
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Joined:Thu Dec 08, 2011 1:23 pm
Posts:61
Car Details:1968 Camaro SS rep.
1966 427 Corvette Coupe.
1999 F150 Lightning.
Location:Midlands
TBI - Throttle Body Injection. Early eighties

TPI - Tuned Port Injection. Late eighties.

Hope that helps.

Cheers Rog.


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 Post subject: Re: engine
PostPosted:Tue Jan 07, 2014 9:04 pm 
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Small Block

Joined:Sun Sep 15, 2013 7:06 pm
Posts:21
ok so what is the difference between them I know the tpi is more powerful than the tbi is there anything else can you put carb s on both of them if you wanted


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 Post subject: Re: engine
PostPosted:Tue Jan 07, 2014 9:47 pm 
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Big Block
User avatar

Joined:Sun Jan 13, 2013 7:00 am
Posts:1158
Car Details:1986 Camaro, bought into Spain by me in 1993.
305 replaced by a 355, 750 Demon carb, RPM AirGap intake, Brodix heads, Hedman Hedders, 3" Flowmaster exhaust.
Wheels are Summit aluminium 5 spokes, tyres are 245 rear 225 front BF Goodrich.
B/M transmission, battery relocated to the rear, GoodMark 4" cowl steel hood.
Location:Spain East Coast
The Throttle Body sits on top of the intake manifold, similar to a carb intake, and has the fuel injectors
mounted in it.Air passes through and mixes with fuel and the mix makes it´s way
down the intake runners to the intake valve and cylinder.

The Tuned Port meters the incoming air which enters the runners to the cylinders,
but here the fuel injectors are mounted in the runners nearer the intake valve.
You´ll see in the article below how the runners take a cleaner run to the cylinder head,
better than the winding runners on the TBI.
http://www.chevyhiperformance.com/techa ... _block_v8/

No, you cannot mount carbs on them.


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 Post subject: Re: engine
PostPosted:Wed Jan 08, 2014 1:03 am 
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Big Block
User avatar

Joined:Fri Mar 19, 2010 1:35 am
Posts:2566
Car Details:79' camaro road & track day toy. 383 stroker, 5 speed TKO trans, lots of suspension stuff, 13" Vette brakes, 18" wheels.
Location:Luton
As explained above but just to ad:
The TBI is sort of like carb but with injectors instead of jets, and looks similar, usually fitted on the lower power variants.
TPI is proper fuel injection with a front inlet intake plenum and seperate injectors for each cylinder, so much more modern, and usually fitted to the higher power variants in the mid 80's to mid 90's.

_________________
“You only live once, but if you do it right, once is enough.”


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 Post subject: Re: engine
PostPosted:Wed Jan 08, 2014 6:14 am 
Offline
Big Block
User avatar

Joined:Sun Jan 13, 2013 7:00 am
Posts:1158
Car Details:1986 Camaro, bought into Spain by me in 1993.
305 replaced by a 355, 750 Demon carb, RPM AirGap intake, Brodix heads, Hedman Hedders, 3" Flowmaster exhaust.
Wheels are Summit aluminium 5 spokes, tyres are 245 rear 225 front BF Goodrich.
B/M transmission, battery relocated to the rear, GoodMark 4" cowl steel hood.
Location:Spain East Coast
And................modern aftermarket fuel injection systems are based on the TBI.
But these systems are light years ahead of the original factory TBI and can be setup quite easily,
they even "learn" the engine´s fuel needs.


A FAST example here;
http://www.summitracing.com/dom/parts/f ... /overview/


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 Post subject: Re: engine
PostPosted:Wed Jan 08, 2014 7:07 pm 
Offline
Small Block

Joined:Sun Sep 15, 2013 7:06 pm
Posts:21
Quote:
The Throttle Body sits on top of the intake manifold, similar to a carb intake, and has the fuel injectors
mounted in it.Air passes through and mixes with fuel and the mix makes it´s way
down the intake runners to the intake valve and cylinder.

The Tuned Port meters the incoming air which enters the runners to the cylinders,
but here the fuel injectors are mounted in the runners nearer the intake valve.
You´ll see in the article below how the runners take a cleaner run to the cylinder head,
better than the winding runners on the TBI.
http://www.chevyhiperformance.com/techa ... _block_v8/

No, you cannot mount carbs on them.
thanks for all the advice on the tpi and the tbi engine you said that you can't fit a carb onto the engine on eBay is that not a carb on the rs whats for sale


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 Post subject: Re: engine
PostPosted:Thu Jan 09, 2014 4:23 pm 
Offline
Big Block
User avatar

Joined:Sun Jan 13, 2013 7:00 am
Posts:1158
Car Details:1986 Camaro, bought into Spain by me in 1993.
305 replaced by a 355, 750 Demon carb, RPM AirGap intake, Brodix heads, Hedman Hedders, 3" Flowmaster exhaust.
Wheels are Summit aluminium 5 spokes, tyres are 245 rear 225 front BF Goodrich.
B/M transmission, battery relocated to the rear, GoodMark 4" cowl steel hood.
Location:Spain East Coast
Quote:
thanks for all the advice on the tpi and the tbi engine you said that you can't fit a carb onto the engine on eBay is that not a carb on the rs whats for sale
What engine on EBay ?

Please re read your sentences before you post, you´re confusing me.

TPI and TBI are fuel injection systems, a carburetor is not like either,
you have injection or carb they are not mixable.

Now post the link to EBay.


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 Post subject: Re: engine
PostPosted:Thu Jan 09, 2014 4:56 pm 
Offline
Small Block

Joined:Sun Sep 15, 2013 7:06 pm
Posts:21
Quote:
Quote:
thanks for all the advice on the tpi and the tbi engine you said tha you can't fit a carb onto the engine on eBay is that not a carb on the rs whats for sale
What engine on EBay ?

Please re read your sentences before you post, you´re confusing me.

TPI and TBI are fuel injection systems, a carburetor is not like either,
you have injection or carb they are not mixable.

Now post the link to EBay.
sorry on eBay there is a rs model for sale with a tbi engine in it and it looks like it's got a carb on it


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 Post subject: Re: engine
PostPosted:Thu Jan 09, 2014 5:16 pm 
Offline
Big Block
User avatar

Joined:Sun Jan 13, 2013 7:00 am
Posts:1158
Car Details:1986 Camaro, bought into Spain by me in 1993.
305 replaced by a 355, 750 Demon carb, RPM AirGap intake, Brodix heads, Hedman Hedders, 3" Flowmaster exhaust.
Wheels are Summit aluminium 5 spokes, tyres are 245 rear 225 front BF Goodrich.
B/M transmission, battery relocated to the rear, GoodMark 4" cowl steel hood.
Location:Spain East Coast
A TBI throttle body sits in the same location as a carb.

This is TBI.
The two injectors can be seen sitting inside the throttle body, they are wired to make them pulse,
squirt fuel.
Image

This is a TBI manifold, two very small bores.
You can´t put a carb on this.
Image

This is TPI.
Image

You can see, each cylinder is fed direct from the plenum on top, that´s where the air enters and is metered.
The fuel rail, feeding the injectors can be seen behind the intake runners from which
the fuel is directly injected at the base of the runner where it joins the cylinder head.


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