I'm very new to the turbo scene. I was thinking of fiting my 1970 bug with a turbo. I was thinking of putting a 914S 2.0 4cyl engine and then put on a turbo. I browsed cb's site and looks like they don't have a turbo set up for a type 4. Does anyone make a kit for the type 4 simlar to cb's hideaway? I will be using this car as a driver with porsche cooling. Will I need an intercooler? How much of a power increase will I be expecting (stock 90hp)? What would you suggest me use for my application? I don't think I will be able to fab my own turbo system. Sorry for so many questions, but anyhows thanks for your help....
Adam
914S Turbo?
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GDRBO
- Posts: 2574
- Joined: Tue Jun 27, 2000 12:01 am
914S Turbo?
I don't believe there is a kit on the market for the type 4. If you can't do it yourself then you will have to pay someone to do it for you (not cheap). you willnot need an intercooler If the system is properly designed however you can get more power with one. There are too many variables to make a prediction on power. Things like how much boost you will run, will there be other mods. like cam, bigger bore, stroker crank. head work etc.
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Jerry D
- Posts: 457
- Joined: Tue Mar 13, 2001 12:01 am
914S Turbo?
I would give CB Performance a call.
They do so much dyno testing and R&D they may have done a type 4 or have the parts needed to do it.
Jerry D.
They do so much dyno testing and R&D they may have done a type 4 or have the parts needed to do it.
Jerry D.
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Rich Hilgersom
- Posts: 26
- Joined: Tue Apr 03, 2001 1:01 am
914S Turbo?
I have called them before.
CB does not produce any turbo type 4 stuff nor do they build type 4 engines in their service division. They only work on type 1s.
-Rich
CB does not produce any turbo type 4 stuff nor do they build type 4 engines in their service division. They only work on type 1s.
-Rich
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Searoy
- Posts: 2869
- Joined: Thu Aug 23, 2001 12:01 am
914S Turbo?
Actually, a turbo will work on a stock engine quite well, since the things that make a stock engine are similar things that make a turbo work well, i.e. low overlap cam and high velocity heads. On the Type 4 if ANY work is done it should start with the exhaust port, since this is the weakest part of the equation for these engines.
The problem with adding boost to a T4 engine like the 914 is the T4 heads. They are known to be the achilliese (sp?) heel of the T4, not just for the exhaust port but also the head stud pattern. With the spread pattern and weak structure of the head physically, it doesn't hold high compression, or boost, very well at all. Special considerations must be taken into account. You can do it, but be careful, and do your homework. It will have to be lower compression and lower boost than a Type 1 is capable of, but with the extra size you shoud be able to make up the difference, and at a lower RPM.
Intercoolers are almost always required. You can get buy without them if you get luck or have an excellent design, but in all cases a properly design intercooler will add power, even in an otherwise very good turbo design.
Since with a turbo you are adding air by pressure instead of displacement, increasing the bore and stroke is unnecessary. In fact a longer stroke isn't needed at all. Increasing the bore is fine. Of course all variables change dependingon your use for the engine. Deisels use a huge stroke with their turbo, and get max boost at ow RPM. Race cars use very small strokes and get max power, a lot of max power, at high RPM. Somewhere in the middle is probably where your target should be. With that in mind a stock engine (of any T4 size) will work.
7.0:1 compression, 8 psi boost, near stock heads with max exhaust port work, stock bore and stroke, stock cam or mild hydraulic cam, aftermarket EFI if you can, turbo volvo CIS if you can't.
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by GDRBO:
I don't believe there is a kit on the market for the type 4. If you can't do it yourself then you will have to pay someone to do it for you (not cheap). you willnot need an intercooler If the system is properly designed however you can get more power with one. There are too many variables to make a prediction on power. Things like how much boost you will run, will there be other mods. like cam, bigger bore, stroker crank. head work etc.<HR></BLOCKQUOTE>
[This message has been edited by Searoy (edited 08-27-2001).]
The problem with adding boost to a T4 engine like the 914 is the T4 heads. They are known to be the achilliese (sp?) heel of the T4, not just for the exhaust port but also the head stud pattern. With the spread pattern and weak structure of the head physically, it doesn't hold high compression, or boost, very well at all. Special considerations must be taken into account. You can do it, but be careful, and do your homework. It will have to be lower compression and lower boost than a Type 1 is capable of, but with the extra size you shoud be able to make up the difference, and at a lower RPM.
Intercoolers are almost always required. You can get buy without them if you get luck or have an excellent design, but in all cases a properly design intercooler will add power, even in an otherwise very good turbo design.
Since with a turbo you are adding air by pressure instead of displacement, increasing the bore and stroke is unnecessary. In fact a longer stroke isn't needed at all. Increasing the bore is fine. Of course all variables change dependingon your use for the engine. Deisels use a huge stroke with their turbo, and get max boost at ow RPM. Race cars use very small strokes and get max power, a lot of max power, at high RPM. Somewhere in the middle is probably where your target should be. With that in mind a stock engine (of any T4 size) will work.
7.0:1 compression, 8 psi boost, near stock heads with max exhaust port work, stock bore and stroke, stock cam or mild hydraulic cam, aftermarket EFI if you can, turbo volvo CIS if you can't.
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by GDRBO:
I don't believe there is a kit on the market for the type 4. If you can't do it yourself then you will have to pay someone to do it for you (not cheap). you willnot need an intercooler If the system is properly designed however you can get more power with one. There are too many variables to make a prediction on power. Things like how much boost you will run, will there be other mods. like cam, bigger bore, stroker crank. head work etc.<HR></BLOCKQUOTE>
[This message has been edited by Searoy (edited 08-27-2001).]
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turbo6bar
- Posts: 601
- Joined: Mon Dec 18, 2000 12:01 am
914S Turbo?
Any cam recommendations? Stock FI cam, or go with a low overlap mild cam. I want to run a supercharger with a 2165cc stroker Type IV (94x78). Big valve heads (48x38). Aftermarket EFI. Do not want to do intercooler, since A/C condenser would be in the way. Intended application is street car, with yearly DE and auto-x thrown in. Basically, I want to rip asphalt off the road. I want to be pushed in the back of the seat, but don't want to run rice-rocket RPMs.
Shoot me some ideas, guys.
Thanks,
jay
Shoot me some ideas, guys.
Thanks,
jay