VW sized supercharger

[Rabbit on Roids]

ok, so, ive made it to alaska, and we have volvo penta mechanical direct inject engines in the boats. they are turbo and supercharged, KKK K26 turbo and a cute little supercharger with an electric clutch on them. they are a pretty compact unit. they look like they would mount up quite easy, and make tons of power. rig the clutch up on a switch or WOT actuator, or just get rid of the clutch all together. cant wait till i get home to start my new build up.

my first question...
since im going to rig it up to help spool the turbo, what would be a good turbo to use? im thinking something pretty big would work pretty well, since the SC will take care of low end boost and help spool the turbo. but what turbo to use? build a K24/26? go with a straight up K26? i have access to some K26's up here also. mostly just core turbos that need rebuilds, but hey.. a free turbo is a free turbo. oh yea, i acquired an injector pop tester. a nice old one too. good quality. so that will be fun to play with when i get home.

anyway, some suggestions would be great. i plan on running the supercharger as the first charger, and run the boost into the turbo. then out of the turbo into the intercooler. should be a pretty good setup right?

[macka]

a MitsuFuso from the little V6, they can do 2 bars no sweat and they have a tonne of them out there.

[barrygti]

I have been thinking of trying a toyota SC14 supercharger on my franken engine.

I am just not sure how much boost the engine will take so it may just have to be fitted to run standard boost(22psi  ) but from very low revs. But the clutch in my Skoda pickup is already struggling at 10 psi...... 

[vwjones]

i was thinking the same thing.  maybe a supercharger on an electric clutch hooked to a normally closed pressure switch that opens at 7 or 8 psi.  Y it into the air intake with a check valve.  that should spool up the turbo wicked fast

[lovinthedeez]

did you drive the rabbit up there?   

[blackdogvan]

Volvo put the SC on their higher HP 6cly engines when they put the larger turbo on & introduced silly lag. VERY SPENDY little beast that do die but worked very well. Make a cool sound when the clutch kickes it in at 1800rpm. These engines were only really good for a few thousand hours before the gremlins came to visit. The internals were pretty good but everything hanging on the engine would eventually die & then it would be $$$ time. Leaky salt water cooled intercoolers putting salt into the engine, turbo's not lasting, starters puking, water pump seals kicking it & leaking salt water right onto the alternators & please don't get me going on the volvo dual prop legs...

You can see the SC's front left here:

[Rabbit on Roids]

those are pretty much the exact same engines we have in our boats. and im not saying im gonna buy a SC from one, im saying i have one, and im going to make it work. i have an eaton M90 also, but its just too damn big physically. these ones are nice and short, and make sweet sounds.

[blackdogvan]

VERY COOL!  I would mount it in the same orientation as stock, they are internally lubed by their own res & have the dipstick on the top, owning them you most likely know that but for the benefit of others reading...

those are pretty much the exact same engines we have in our boats. and im not saying im gonna buy a SC from one, im saying i have one, and im going to make it work. i have an eaton M90 also, but its just too damn big physically. these ones are nice and short, and make sweet sounds.

[Rabbit on Roids]

im going to low mount it in front of the water pump, where the alt would be, and run an AC alt mount so i can high mount it. should be a pretty foolproof setup. and im probably going to use the pulley from the volvo too, since it already has a single V belt groove and a fairly large serpentine pulley. should drive it with enough RPMs to make it operate fairly efficiently right? or should i look for a smaller pulley to drive it with?

[blackdogvan]

I dunno, check out the crank pulley size on the volvo & crunch some numbers. I never ran these with a boost gauge so I don't know how much boost the SC would make. I recall the volvo's are 3.9L?? Figure if you could get 60-75% of the Volvo's SC rpm would be a good start point. I'd also be thinking about a upgrade on your Tbelt sprocket, maybe a few solid pins? Any idea how much HP it takes to drive that SC?

Think of the noise that's going tomake!

[Rabbit on Roids]

I dunno, check out the crank pulley size on the volvo & crunch some numbers. I never ran these with a boost gauge so I don't know how much boost the SC would make. I recall the volvo's are 3.9L?? Figure if you could get 60-75% of the Volvo's SC rpm would be a good start point. I'd also be thinking about a upgrade on your Tbelt sprocket, maybe a few solid pins? Any idea how much HP it takes to drive that SC?

Think of the noise that's going tomake!

the SC is driven off the waterpump, but im sure you know that. the crank pulley on the volvo is pretty large, and it drives a significantly smaller pulley on the water pump. then the water pump has a pretty huge pulley that drives the SC. this pulley must be 7.5 to 8 inches in diameter. so it has a double induction. im thinking the SC spins pretty fast. and i remember that an eaton M90 takes 40 horses to spin. and this unit is significantly smaller, and only has 2 lobe rotors, compared to 3 lobe rotors in an M90. so it would probably take 25 HP to spin. is that a pretty good guesstimation? oh yea, our volvos are 4.4 litres or something like that, i did the math and figured it out one day, but i forget exactly what i came out with.

and yes, im hoping it makes plenty of noise, i want it to be known that im running a STD (Super Turbo Diesel) lol

[blackdogvan]

I haven't been around a set of volvos for a while, I forgot the huge pulley is the coolant pump pulley. Do you know how much boost it makes before it cuts out for the turbo? FYI I'm pretty sure they are 3.6L. How do you feel about putting that much Hp through the front of the crank in stock form?

[Rabbit on Roids]

I haven't been around a set of volvos for a while, I forgot the huge pulley is the coolant pump pulley. Do you know how much boost it makes before it cuts out for the turbo? FYI I'm pretty sure they are 3.6L. How do you feel about putting that much Hp through the front of the crank in stock form?

i checked today and our engines are 4.2 litres. im not sure what boost they run when engaged, because the piping to the turbo in my oppinion sucks, its held on by a set screw. doesnt seem like a very good seal if you ask me. and honestly i could care less how much power im going to be using out of the stock crank sprocket. the engine was free, it has 3 different pistons and rods in it, the head has never had the valves adjusted. so its pretty much one of those "if it blows, then it blows" type of deals. im kinda wondering how long its going to take me to blow the head off this engine. i have a 1.6TD sitting in my bedroom at home, just waiting to be freshened up. im going to build that one right tho. head studs, metal gasket, the works. im pretty sure my engine in there right now is the ancient 1.5 that has a keyed timing sprocket on the crank, rather than just a tiny key sticking up out of the sprocket. should be a way better setup than the later 1.5 and 1.6 setup..

anyway, i think im oging to see if i can set up a better seal between the turbo and charger and bet an accurate boost pressure from the charger. im pretty sure they are running like 15 psi after the turbo tho. and they dont spool for dog *** without the charger. just had a shredded charger belt today. i asked the guide if he lost any power and he didnt really notice much, but hey, most of the guides here are total idiots. oh, by the way, these chargers are made by wankel for volvo penta. i wasnt sure if i really liked the idea of having volvo pieces on my car, but now that i fould out that its a wankel charger, i feel a little better about it. im really looking forward to running it with no turbo and on a switch, so i can use it for accelerating, then switch it off to get some ***in mileage.

[kd4yor]

what model are the Volvos?

Use an Eaton M45 blower for any of the 1.9L and under VW's

[mystery3]

How about an m62 from a mercedes "kompressor"

Or one from the early mini cooper S those are 1.6L, another consideration are the units in toyota previas? I have no idea what unit they run but you can easily find them at the junkyards around here and I don't think the toyota motors are bigger than 2.4L or so?

Do you have a serpentine belt setup already?