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After much umm'ing and arr'ing, ive made up my mind on what im gonna do with the 3F petrol/gas.
Its done a head gasket a week ago and only went in yesterday to get fixed, so when it comes back i will start work on installing a SC14 supercharger.
I'm happy with what this particular blower will offer for the 3F, they normally operate at around 6-7psi but can be made to go up to 11 or 12. And its a Toyota item, they are used on the trueno (spelling) buzz boxes and mr2's, although many a v6 commodore has happily accepted one and have worked well.
My only question, generally, when supercharging what else should be upgraded/changed. i want some background info when going to the pros to have it fine tuned.
I dont mind if it hasnt been done before, consider me as a guinney pig
You need to do some math, it'll probably work as the 3F isn't much of a revver, bearing in mind that blower is designed to make 7 psi on a 2.4 liter engine, it will need to spin nearly twice as fast to produce 7 psi on a 4.0 L engine. I think you will find they disconnect at high revs on the origional vehicle, I'm not sure at what revs though. An engine is an air pump, you want boost you have to fit a bigger pump to fill it up. As the 3F is only good for 4000 rpm or so you may get away with it. But don't expect too much as spinning these little blowers at high rpm creates a lot of intake air temperature.
they come off the 1ggze which is only a 2 lt, but the rev hard like 7000rpm, i think they turn them off at idle too not high revs
it should be ok, CRS do a kit for 3.8 commy, it just going to be a hassle getting the pullys right to make it work well, the pully on it looks very small so might work out ok
PGS 4WD wrote:You need to do some math, it'll probably work as the 3F isn't much of a revver, bearing in mind that blower is designed to make 7 psi on a 2.4 liter engine, it will need to spin nearly twice as fast to produce 7 psi on a 4.0 L engine. I think you will find they disconnect at high revs on the origional vehicle, I'm not sure at what revs though. An engine is an air pump, you want boost you have to fit a bigger pump to fill it up. As the 3F is only good for 4000 rpm or so you may get away with it. But don't expect too much as spinning these little blowers at high rpm creates a lot of intake air temperature.
Joel
my 3f loves to rev around to 5500+ rpm( it does have a bit of head work and cam)
Yep, Ive been down the supercharger track. Find out what blades it has (teflon coated etc) and find out what the max rpm they can handle is. That will tell you right there if its big enough for your engine and what expected gain. Then look at your max rpm (rev limiter) and set it upto that (pulley size) and not your red line because I garantee 1 of your mates will want a drive and not be ready for how quick it will rev and hit the limiter. What ever boost you end up with is it then. Only other option change the supercharger.
And all the other posts are right. They are noisy and do get very hot. Id intercooler forsure if its a daily driver.
Thanks for the unput guys.
I know it came off a torana 6. I will have to do some more talking to people to see if its gonna be right for the 3F but im thinking as well it should be ok, im gonna do this with some headwork and a cam, and an exhaust system.
What ive also been thinking about is the intercooler, but im gonna have a snorkel as well and dont know if its all gonna fit under the bonnet with all the piping and stuff.
That the problems you face though. Trust me they get hot (but not menlt down turbo hot) either way they heat the intake charged air with out an intercooler.
When I did mine there where 2 superchargers. The 1ggze engine and another 1. 1 was way smaller than the other. But the picture youve got the smaller 1 as mine looked different to that. You might need to go to the bigger 1. Hopefully you can find the room to fit it.
Mate, I think this is a great idea, I'm sure it can be pulled off. I have no idea what the gains would be or whether it would work well but I wish you luck.
I have had this exact same idea going through my head the last few days and was researching it a bit last night but found this today.
I too have a 3F petrol/gas in an FJ70 and it goes ok, but a little more would be nice in the mud.
Things to consider:
*Can't blow through the carby, from what I have read they need to be modified to be sealed. Can also have an effect on the float and other stuff inside.
*Not sure on this one, but can't run fuel through the SC. Some reporst are that it would ruin the teflon but I thought teflon was fuel resistant.
*How to get the mixtures right. I'd ideally want to keep it dual fuel but straight gas might be easier from the point of only needing a throttle body instead of the carby.
*Working out the max RPM you want and calculating a pully size to keep the SC under it's max RPM should be easy.
I'm very un-educated on the topic so far and will be researching more and keeping a keen eye on how you go.
I had the same charger on an rb30 (3L v6) made 7 psi and would have revved more than the 3f.
Should be ok, but an mentioned worth cooling it.
I personally found the whine fun - for the short time i drove it. it certainly didnt sound stock but wasnt that loud.
*there's a rock, drive over it :) there's a bigger rock, drive over it :twisted: there's an even bigger rock, oops broke it :oops: Upgrade broken bit :bad-words:
Goto *
if its going to blow thru the carby you can out the whole carby in a box
so the pressure fills the box as well, therefore the same pressure in and out of the carb, so sealing is not an issue then
will need to run some sort of low pressure rising rate fuel reg, other wise the pressure will push the fuel back up the line= fail
ive seen these run fuel thru them before, not sure how long it lasted tho, cant run a cooler that way tho, other wise you have issue with back fires and potential bombs under bonet
the fuel in the charger will help to cool the inlet charge tho
The 3F did come fuel injected, but not here in Aust, in the US. Maybe worth seeing if you can get a set up from the states, Matt McInnes who is a member on here bought a whole engine from the states and had it shipped over for 300$?
that would be a 3f-e as used on some early 80 series im using a 3fe inlet manifold on my 2f but have blocked the injector ports and am running straight lpg
cheapest way is to go straight lpg can use either a impco 225 mixer or a gas research setup
both work great as a blowthrough setup
flyology wrote:The 3F did come fuel injected, but not here in Aust, in the US. Maybe worth seeing if you can get a set up from the states, Matt McInnes who is a member on here bought a whole engine from the states and had it shipped over for 300$?
The engine was out of an 80 series here, 1990-92, 80 series auto's are all 3FE. Manual they are all 3F here. In the USA the 62 series got the 3FE here we did not as it was not required for emissions. I only used the head from this and it's injection system.
The 2F or 2FE is a better engine to supper charge and you get an extra 300cc to boot over the 3F.
