Done the research now its question time...

[6CylAtTinker]

Ok i have been in the "books" and talkin with Tommy and a couple other people about turbos, as far as what kind to get and what works. I've been studying some of the pictures to see how things are set up etc... My question is about superchargers. I'm wondering if anyone here has worked with superchargers for their six. I'm thinking about going the supercharger route because i really like the idea of the FSPP dual header. Now i am asuuming that running a turbo means a "no go" for the dual header option. So if anybody has a supercharged six i'm curious if there is a lot to consider when picking a supercharger, what kind is reccomended for an I6 and where to get one from.

Thanks,
Frank

 

[Inline6Merc]

I’m in the processes of putting a supercharger on my car right now. I’m going to be using a M90 supercharger since its cheap and it makes boost. The M90 is a root type blower so it can create unwanted head. An intercooler or water injection helps solve that problem. The nice thing about them is that they make low end power, were a centrifugal wouldn’t. One of these blowers can be had on e-bay for a $100-150 price range. You could also use a centrifugal type blower but they are kind of pricey. A turbo would be easier compared to a supercharger, but the supercharger is still basic. Just make a bracket, pulley system (hardest part) and carb bonnet. Easier said than done, but you get the idea. The S/C requires more time, fabrication, and thought; but well worth the extra effort. I’m hoping to have the setup done by this summer, so I can share pictures, 1/4 mile times and all that good stuff. Hope that helps!

Later,

Curtis

 

[6CylAtTinker]

when you say unwanted head.... what does that mean?

 

[wallaka]

Heat

 

[Bobscoupe]

Never heard of "unwanted" head.

I had a M90 set-up but couldn't work out all the bugs. I don't think you generate any more heat to the intake then you do with a turbo system. I believe you could run up to 10 lbs of boost without an intercooler. However an intercooler will make it more effecient then without.

The hardest part is belt alignment. It has to be perfect or you will throw the belts off at high rpm. I also blew two head gaskets. If I was building a weekend racer/driver I would definetly go with another M90 set-up. I believe the problems can be worked out fairly easily. But for a daily driver that you depend on to get to work and back it may not be such a great idea.

Make sure you build a lower end that can handle 5000 + rpm because it will get there pretty quick with a blower. You will not believe the torque. It will snap you head hard when you hit second. Throttle response was immediate.

Bob

 

[wallaka]

Never heard of "unwanted" head.
I don't think you generate any more heat to the intake then you do with a turbo system. I believe you could run up to 10 lbs of boost without an intercooler.

Most turbos will be a good 20% more efficient than a Roots blower. This means lower intake temps right off the bat. It is also much, much easier to plumb in an intercooler. I would also think that the M90 would be running out of steam at over 10 psi...a T40B would be just starting.

That blower whine does sound good though....depends if you think it's worth the extra work of belt alignment and mounting brackets, pulleys et al. A lot more precision is needed vs. making a J-pipe and sticking it on the stock exhaust manifold.

The Eaton M90 is the most common supercharger in the junkyards, used from Thunderbird Super Coupes to the GM 3800 engine (Regals, Grand Prix GTP, Bonneville, etc). The ones from later years are redesigned and are slightly more efficient. They have a different intake and outlet as well...I forget the exact changes. They're on eBay all the time, just look for them.

Mustangaroo (I think) has a centrifugal supercharger on his...you could probably PM him for details on those. I gotta say, though, that since the centrifugal 'charger is just the cold side of a turbo I'd probably just go with a turbo instead.

 

[6CylAtTinker]

so am i correct in assuming that having a turbo means i can't have my cake and eat it too, in regards to the dual fspp header?

 

[Fred]

However many exhaust outlets you have, you need that many turbos.

Another option is a centrifucal blower with a clutch on it. You can draw through a centrifucal blower when it is not on unlike a roots blower. Machine one of the big old clutches from a York A/C compressor to fit the blower shaft. This way you can run less expensive gasoline when you arn't racing.

 

[Mustangaroo]

running a turbo means a "no go" for the dual header option. So if anybody has a supercharged six i'm curious if there is a lot to consider when picking a supercharger, what kind is reccomended for an I6 and where to get one from.

I'am running Clifford Dual out headers, have "Never" thrown a belt in almost 2 years using standard v-belts! Superchargers require RPM if your I6 runs it will make boost, if it can turn 5,000 rpm it can make lots of boost! Turbo's can make more boost than superchargers, if you wanting 15-20 psi get a Turbo, if you can live with 5-10 psi and killer low end power, cool whine, and figuring out how to mount what ever supercharger unit you get, you will love it! I do belive in many ways the Turbo is easier and it will produce more HP as most Superchargers use about 30HP to create the boost and Turbo's use "0" HP. I'm about to start working with my son Jason on installing a Turbo on his 1965 Mustang after finishing that project I will then be better able to tell you which was easier! Good luck and have fun with whatever you decide....

 

[6CylAtTinker]

Do you think having a dual exhaust header makes up for the 5-10 loss of horse power with a supercharger?

 

[6CylAtTinker]

However many exhaust outlets you have, you need that many turbos.

So what you're saying is if i want to run both the header and turbo option i would have to find a way to mount a turbo to each header outlet....twin turbos? :idea:

 

[Anonymous]

Running a header with turbo is nonsense if your not going for the most hp intead run a big and good downpipe and exhaust after the scroll.

 

[Anonymous]

Running a header with turbo is nonsense.

Correct.

Long, tubular headers work terrible with turbos. You lose too much heat and there is too much distance from the exhasut valves to the turbine. IDEALLY, you would want about 3" or less distance from the exhaust valve to the turbine, but that's too impractical (unless it's a one cylinder engine!!)

Use a modified cast manifold or make a header like this (Toyota):

http://www.menet.umn.edu/~vandeven/turbo2f.htm