1.5 diesel + supercharger = feasable?

[Baxter]

Heres a G60, looks like there could be room!

[lord_verminaard]

The G60 should bolt up to the 1.5 block without problems, you might have to fiddle with the belts to get everything to line up but that's easy.  Factory G60 cars had a pressure relief valve built into the throttle body, but that's something that the Diesel will not need.  G60's have a reputation for being a bit fragile but properly cared for they will last a long time.  I'm with everyone  else here, you shouldnt need oil squirters- the boost and EGT will not be high enough to worry about.  Also, any 8-valve counterflow headers made for gassers will fit the 1.5, which will add to the power and efficiency.  If you're made of money, you could always slap on a Lysholm, they are bad-ass!
http://www.bahnbrenner.com/media/php/catalog.php?pid=603

Good luck, I say go for it.

Brendan
84 Scirocco 8v
00 Camaro L36 M49

[greggearhead]

The G60 might be in the way of the injection pump - not sure.  Haven't had one in the garage in a little while.  

I hadn't thought of turbos running higher piston temps than a supercharged engine - as typically, most superchargers run much higher air charge temps.  I don't know, just throwing it out there for thought fodder.  

I would love to see a supercharged 1.5/1.6 (base NA) engine, and with the cheapness of Eatons on ebay, it might be a very viable option for decent power without losing all of the economy.  It takes a surprising amount of hp to spin a blower, but it has worked for a very long time.  Keep us informed.

[745 turbogreasel]

Many serious(tanks, racing tractors, etc) diesel motors run both with max boost in the 60-90 PSI range

As I see it, the piston heating in turbo engines is mostly to do with having the ability to burn twice as much fuel per cycle=twice the heat generated.  I don't think your EGT cares where the boost came from.

the Eaton unit found on Ford Supercoupes has a nifty bypass unit that reduces noise and wear at part throttle operation(how often you run a 1.5 at part throttle???).  A wide range of pulleys, and several drive snouts are available.  It has its own oil sump.

Power without losing the economy??? Turbos improve economy, its the driver that screws it up.

[jtanguay]

I still believe that opening up the exhaust will reduce the back pressure enough to keep egt's very low with a supercharger.   Until the turbo is fully spooled up, it generates quite a bit of back pressure which in turn keeps heat in the motor.  Even fully spooled the turbo will have enough back pressure to do damage to critical engine components.  True, that the extra fuel will add more heat, but then again a lot more of that heat will be sent through the downpipe and out the exhaust.  When climbing certain hills I can see my engine temp rise quite a bit.  I doubt it would if I had a supercharger.

If I was adding the supercharger to the 1.5 n/a, it would be merely to assist passing/hill climbing, and maybe that extra kick whenever I would need it.  Supercharging would be much safer than adding a turbo, but definitely not yield the same performance enhancement.   The HP loss is miniscule at best in the low rpm range, but would probably rob the motor at higher rpm just like the a/c pump.

[gldgti]

at the moment, the car has a free flowing 2" exhaust right back from the standard duel downpipes. i noticed a difference in running temp of the car immediately after this was installed 2/1/2 years ago...

a larger difference in running temperature occurred last year when i modified the airbox intake hole to take an 80mm intake pipe, and ran a pipe straight to the front to get cold ram air from the front of the car.. this made a big difference to my engine running temperature, plus increased power and torque noticable at low revs and high revs alike.

since modding the engine, compared with when i first got the car, my temperature guage (which still has the same thermostat as before) runs about 3-4mm on the cool side compared with originally... (our temp guages dont have measurements over here, just a red zone....i need an egt gauge..)

i'd say then that my mods have made the car run significantly cooler than a standard 1.5 - indeed, on the same trip, driving together, i've pulled up at destination with dad and compared engine bay temps with my dad (he also has a 1.5, unmodded, but with recently rebuilt bottom end and brand new head) and his golf is always warmer under the bonnet than mine.

im very keen to attempt this now - rather to make it work well.

[gldgti]

well, guys....

i've just come into posession of a supercharger.... bought it off ebay for $280AUD

its a "FUJI heavy industries" supercharger, off a small capacity car (suzuki i think). anyway, it was last on a "low revving 1.5l engine, producing 7psi". Sounds like the ticket!

its very small and compact, and im sure fabricating a bracket ofr it will be a piece of cake.

can anyone tell me now, what will i need in this setup to ensure i dont break my engine?

cheers

aydan

[jtanguay]

hmmmm.... inspect it and make sure no parts from the supercharger will get passed through the intake manifold into your motor???  Make sure you mount it very secure.  If it were to come loose, possibly something could get sucked into your motor and ruin it  other than that you are good to go.   I would consider a bigger pully to make more psi though  :twisted:   but you can do that after you install it and see how she runs with the 7 psi.  

I dont think you should really need anything to protect your motor...  

with 7 psi and some extra fuel, you should be able to scale steep grades with relative ease

Good luck!

[Baxter]

FUJI Heavy industries is Subaru I think, cars badged up as Subaru's but the chassis plate has FUJI heavy industries platered accorss the top!

[gldgti]

thats right, fuji heavy industries is subaru, and they make robin small industrial engines aswell.

also, they make parts ofr toyota and suzuki.

anyay...

how much boost do you guys think a 1.5 could handle? i was thinking 7 might be ok for an indefinite timescale, but what about 10 or 12? (more boost is good for me! :twisted:

the compression ratio of the 1.5 n/a is 23.5:1 ... so i was a little concerned about the idea of forced induction but im not to worried about 7 psi... thats onlt 1/2 atmospheric pressure extra...

cheers

aydan

[gldgti]

ill be sure to put some pics up soon too should you guys want to see just what im getting myslef into, hehe

[jtanguay]

thats right, fuji heavy industries is subaru, and they make robin small industrial engines aswell.

also, they make parts ofr toyota and suzuki.

anyay...

how much boost do you guys think a 1.5 could handle? i was thinking 7 might be ok for an indefinite timescale, but what about 10 or 12? (more boost is good for me! :twisted:

the compression ratio of the 1.5 n/a is 23.5:1 ... so i was a little concerned about the idea of forced induction but im not to worried about 7 psi... thats onlt 1/2 atmospheric pressure extra...

cheers

aydan

well the way I think it works, is that the extra boost pressure gets compressed, thus increasing the compression by much more way more than stock 7 psi getting compressed 23.5 times over.  I'm not sure how great the 1.5 head gaskets are, but that could possibly be an area of concern.  

I would say test out with 7 psi, and look at upgrading ur HG if you decide to go with the bigger pulley  :twisted:

[TDForNow]

Power without losing the economy??? Turbos improve economy, its the driver that screws it up.

BUT, it's one of the few times you'll have fun screwing up !!

[745 turbogreasel]

I am not afraid to admit my weakness :lol:

i wold want piston squirters, and if going much over stock boost, consider going a size thick on the HG.

[TDForNow]

I know i'm sounding like a ney-sayer, but with a 1.5L, I think you'll be useing half of your basic hp to crank the SC. Any net gains could be diminished by that. Maybe ok for dedicated hi-rev applications, but I think you'll only break-even off idle from combatting parisitic losses. But I've been known to be wrong also, just my 2 cents. Good luck!

Alain