Supercharged AJP ?
Discussion
A question for the clever guys!
Has anybody supercharged an AJP? Ive seen the twin turbo threads but cant find any on a supercharger.
I know the compression ratio is already high but if the 4.5 in its NA tuned form with cams induction exhaust and remap can make nearly 450bhp, why can't the same engine take a low pressure Vortech supercharger with enough boost to acheive 450bhp.
At these low levels of boost possibly around 3 to 5psi you would not need a intercooler and the standard induction setup may well handle the pressure without mods.
if it was possible it may be a good way to go to acheive higher power
any thoughts?
Has anybody supercharged an AJP? Ive seen the twin turbo threads but cant find any on a supercharger.
I know the compression ratio is already high but if the 4.5 in its NA tuned form with cams induction exhaust and remap can make nearly 450bhp, why can't the same engine take a low pressure Vortech supercharger with enough boost to acheive 450bhp.
At these low levels of boost possibly around 3 to 5psi you would not need a intercooler and the standard induction setup may well handle the pressure without mods.
if it was possible it may be a good way to go to acheive higher power
any thoughts?
Remember that the s/c has to be mounted to the engine (not the chassis due to movement) and that there would be considerable loads imparted by the drive.
The bracketry required would be substantial and getting the alignment right crucial.
A much simpler route to more power would be the one Steve Heath, Brummmie and others have taken. It would be much less trouble too.
The bracketry required would be substantial and getting the alignment right crucial.
A much simpler route to more power would be the one Steve Heath, Brummmie and others have taken. It would be much less trouble too.
Not sure if fitting a 6.9ltr yank motor would be easier than fitting a supercharger. The Vortech unit is very compact and specifically designed for aftermarket fitting. It does not need to be fitted between the Vee. The plumbing at these low pressures would be in silicon hose. Just not sure if the existing air box and induction hoses will take 5psi.
I might stick two potatoes up my exhausts and use my compressor to inflate the intake system I'll let you know at what pressure something blows off
hopefully not the heads!!!!!!.
If its feasible I might make this my winter project. By the way the supercharger and plumbing costs around £1500.00. brackets remap etc etc all extra.
Any info from on previous attempts good or bad would me much appreciated.
I might stick two potatoes up my exhausts and use my compressor to inflate the intake system I'll let you know at what pressure something blows off
hopefully not the heads!!!!!!.
If its feasible I might make this my winter project. By the way the supercharger and plumbing costs around £1500.00. brackets remap etc etc all extra.
Any info from on previous attempts good or bad would me much appreciated.
You might have something here.I don't see any reason why a modified A/C drive pully could not be used for this. And the charger could then mounted in front of the engine on brackets fitted to the engine if required.
I don't however think the original air boxes would cope with 5psi as they are not "round".
5 psi is a lot of pressure and exerts a huge force when mulitplied over a large surface area of the odly shaped air boxes.
If you want to test them, take them off, block-up the holes and stand well clear! Splitnters of fibreglass will blind you!
The air boxes in their current design would not be needed in a supercharged set up, so best to make more room for the hoses and perhaps a stainlees steel manifold of conical shape of max volume to act as a plenum chamber to hold the charged air. Pressure tested of course!
Steve
I don't however think the original air boxes would cope with 5psi as they are not "round".
5 psi is a lot of pressure and exerts a huge force when mulitplied over a large surface area of the odly shaped air boxes.
If you want to test them, take them off, block-up the holes and stand well clear! Splitnters of fibreglass will blind you!
The air boxes in their current design would not be needed in a supercharged set up, so best to make more room for the hoses and perhaps a stainlees steel manifold of conical shape of max volume to act as a plenum chamber to hold the charged air. Pressure tested of course!
Steve
Looking at the existing induction setup its the airboxes as VPOWER also indicates will be the weak spot. Rather than making new boxes it might be better to reinforce the original ones? stainless straps or something similar might work if engineered correctly.
I know large airboxes are not necessary with F.I. but they can be an advantage, I increased the size of the plenium on my Escort cossie with a 12mm spacer and got an extra 9bhp.
I also would like to keep the cost and any none essential work to a minimum so that other Cerb owners may go the same way.
I know large airboxes are not necessary with F.I. but they can be an advantage, I increased the size of the plenium on my Escort cossie with a 12mm spacer and got an extra 9bhp.
I also would like to keep the cost and any none essential work to a minimum so that other Cerb owners may go the same way.
jonbarrett said:
Regards a shaft drive, I've seen very powerful industrial applications using telescopic shafts and UJs.
Fitting the blower in front of the belt line improves the induction layout too. The blowers usually used have an input at the opposite end to the drive, and the conventional installation means the intake has to double back on itself in a very confined space. Mounting the blower in front would enable the air to be drawn directly from a cold supply at the front of the engine bay and then blown straight out to the intake manifoldIf you supercharge an AJP you would need to change cam shafts (less overlap on exhaust).
Lower Compression ratio ( 8.5 - 1 ), Increase engine cooling, retard ignition timing, make new air boxes, re-map fueling, Bigger injectors and bigger fuel pump to stop it leaning off at the top
Lower Compression ratio ( 8.5 - 1 ), Increase engine cooling, retard ignition timing, make new air boxes, re-map fueling, Bigger injectors and bigger fuel pump to stop it leaning off at the top
Edited by philcerb on Sunday 24th May 20:12
philcerb said:
If you supercharge an AJP you would need to change cam shafts (less overlap on exhaust).
Lower Compression ratio ( 8.5 - 1 ), Increase engine cooling, retard ignition timing, make new air boxes, re-map fueling, Bigger injectors and bigger fuel pump to stop it leaning off at the top
You'd certainly need to remap, whether you need to uprate the pump and injectors and cooling system depends how much extra power you aim, cam and compression ratio changes would depend on the blower type and boost levels but wouldn't be required in every case.Lower Compression ratio ( 8.5 - 1 ), Increase engine cooling, retard ignition timing, make new air boxes, re-map fueling, Bigger injectors and bigger fuel pump to stop it leaning off at the top
philcerb said:
cams would be a must blowers hate overlap you lose charge down the exhaust.fueling needs to stay rich at high revs (holed pistons,burnt valves,head gasket) to be avoided
Not necessarily. Mine ran OK on a 218 and that's a rootes blower. A centrifugal blower which only produces full boost at high revs would be even less fussy about the cam.At modest boost you may find you can get away with a fairly standard CR as long as you pull the timing and don't let it run lean, water injection gives you more room to play with.
philcerb said:
cams would be a must blowers hate overlap you lose charge down the exhaust.fueling needs to stay rich at high revs (holed pistons,burnt valves,head gasket) to be avoided
Depending on the s/c being used boost will tail off at upper rpm's. As for overlap that can be good for top end in a blown engine. For low boost applications simple tuning mods usually suffice. Plenty of blown engines use stock cams.Gassing Station | Cerbera | Top of Page | What's New | My Stuff