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914World.com _ 914World Garage _ supercharged
Posted by: grasshopper Jan 8 2005, 10:21 AM
anyone ever tried to turbo charge or supercharge a bus engine? anyone know if they sell turbochargers or superchargers for bus engines. I have heard of the judson supercharged engines but i dont think they still make those. I think it would be pretty neat to have a turbo 914. Just imagine looing at the back of a 914 "914 turbo" I've got a few bus engines sitting around here and a few engine-less 914. 
Posted by: Root_Werks Jan 8 2005, 10:35 AM
I know of 2-3 guys on the club here who have done successful turbo's on 914 motors. A bus engine wouldn't be much different other than they are built for torque, not high rpm hp. I have a GE case in a 914 right now, bus 2.0. I haven't driven it yet, but have been told it is all low end and I won't like it. 
Not sure if that means it also wouldn't be a good engine to turbo/supercharge?
Posted by: ruddyboys Jan 8 2005, 10:40 AM
What would you do different to make it a a high RPM vs high torque?
Posted by: Dave_Darling Jan 8 2005, 10:41 AM
You'll have to get very creative to come up with a way to drive the supercharger. The firewall at the front of the 914's engine bay tilts back, and may interfere with any decently-sized belt and pulley arrangement. You may be able to go off to the side, but you will likely have to relocate various engine bay items (heater blower, battery tray, ECU, maybe the relay board, depending on where you go and how much room you need) to do that.
--DD
Posted by: Root_Werks Jan 8 2005, 10:50 AM
| QUOTE (ruddyboys @ Jan 8 2005, 08:40 AM) |
| What would you do different to make it a a high RPM vs high torque? |
Not much, I have been told it is the cam and compression. I thought about pulling this engine out and putting in a different cam and P&C's, seeing what that did. It is like a 78' Bus motor and runs great. But the clutch is bad so I haven't had a chance to drive it yet. Hey, it's a 2.0!
Posted by: Bleyseng Jan 8 2005, 11:11 AM
The hydrocam with the hydrolifters kills high rpm power. The other problem is sealing the head to cylinder leaks with a 2.0l as there isnt much meat there. A 1.7l works much better for a turbo.
Geoff
Posted by: grasshopper Jan 8 2005, 11:21 AM
sounds like i'm going to have to do alot of ajusting in the engine compartment . The battery could be relocated in the back trunk and i could go to the right. Then there isn't anything on that side. What the heck. I havn't even found a turbo kit yet. a bus engine might not be bad after its turbocharged
Posted by: Root_Werks Jan 8 2005, 11:23 AM
| QUOTE (Bleyseng @ Jan 8 2005, 09:11 AM) |
| The hydrocam with the hydrolifters kills high rpm power. The other problem is sealing the head to cylinder leaks with a 2.0l as there isnt much meat there. A 1.7l works much better for a turbo. Geoff |
Der! I totaly forgot about that. So my GE case is a hydrolifter case? Wow, hmm, that is tempting to just leave it as is then? Hmm?
Posted by: Cap'n Krusty Jan 8 2005, 12:00 PM
| QUOTE (Root_Werks @ Jan 8 2005, 08:50 AM) | ||
Not much, I have been told it is the cam and compression. I thought about pulling this engine out and putting in a different cam and P&C's, seeing what that did. It is like a 78' Bus motor and runs great. But the clutch is bad so I haven't had a chance to drive it yet. Hey, it's a 2.0! |
The cam? Naaaahhhhh. Same cam. The compression is a bit lower than the European set for our 2 litre engines, but the big difference is in the heads. The Cap'n
Posted by: Cap'n Krusty Jan 8 2005, 12:03 PM
| QUOTE (Cap'n Krusty @ Jan 8 2005, 10:00 AM) | ||||
The cam? Naaaahhhhh. Same cam. The compression is a bit lower than the European set for our 2 litre engines, but the big difference is in the heads. The Cap'n |
Lemme correct myself. The SOLID lifter cams are the same, and the Hydraulic lifter cam is the one lazy people put into their 914s. Yes, you'll likely see lower performance out of that, but you can also put the solid lifter cam in a bus, like VW did until 1976 or 1977. Not that you can really tell the difference. The Cap'n
Posted by: Bleyseng Jan 8 2005, 12:19 PM
yep, '78 and newer buses but lots of rebuilts 2.0l bus engine went with the "upgrade". The hydro cam has a different profile and ramps so its pretty weak. I can't say I'd turbo a hydro bus engine but see what the bus engine is.
Geoff
Posted by: Mueller Jan 8 2005, 01:37 PM
| QUOTE |
| I havn't even found a turbo kit yet. |
and chances are you aren't going to...nor will you find a supercharger kit....it does not matter if you want to use a 914 engine or bus engine, there is not going to be any kits that'll allow you to just bolt on a turbo or supercharger without plenty of fabrication and engineering work involved......
you should buy and read a few books 1st on the subjects, Corky Bell has a turbo book out as well as a supercharger book, both highly recommended
Posted by: Jake Raby Jan 8 2005, 01:51 PM
With a TIV and any forced induction the same issues are still present whether its Turboed or SuperCharged....
I have Supercharged 4 different TIV engines, the most recent for a UK customer to use in a Split window VW Microbus...
We got the power, but it took extremes to make the platform solid enough to do so.
in 2002 I actually had a TIV Supercharging kit available but pulled it off the shelf after all 3 guys that bought one screwed up the install.
Did I mention that Hydro lifters are the worst thing that can be done to a TIV engine????? Well- They are!
Posted by: Brando Jan 8 2005, 03:45 PM
on the question of supercharging...
How abouts do you compensate extra fuel injection for that? Or do you run the extra intake off of a carburetor? I could see having to make an extra bracket, find a place to mount the supercharger, fab up an intake manifold, and all the extras... Jake, how hard was your "kit"? Last i heard Aaron has a low compression 1.7 soon to be in his posession. With access to some sheetmetal tools i think we could work something... 
Posted by: Mueller Jan 8 2005, 08:57 PM
| QUOTE (Brando @ Jan 8 2005, 02:45 PM) |
| on the question of supercharging... How abouts do you compensate extra fuel injection for that? Or do you run the extra intake off of a carburetor? I could see having to make an extra bracket, find a place to mount the supercharger, fab up an intake manifold, and all the extras... Jake, how hard was your "kit"? Last i heard Aaron has a low compression 1.7 soon to be in his posession. With access to some sheetmetal tools i think we could work something... |
for extra fuel=no different than a turbo....you ditch the stock FI and go with an aftermarket programable setup.....or use CIS like the few 914 turbos on the list are doing...
for driving of the supercharger, just copy how the dealer/aftermarket installed the airconditioning compressor...a better belt system would be needed since I doubt that skinny little belt could drive a supercharger, but for low boost applications, it might work???
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