4age 20v + supercharger

[Harreh]

The upper supercharger mount is on the SC inlet plenum, so fitting the lower bracket is only half the battle

[GUN METAL]

I thuink its a great idea buts its not going to be easy, probly makes more sense to ditch the 20V and flog it and drop in a an AE101 GZE and put a pulley on it.

if you do whack it on i wouldnt be overdriving it at all infact i would probly underdrive it, one so its more efficient and 2 so you dont blow up the relativly fragile 20V with massive boost, especially if your going to be running the the limiter all the time

intercooling and ECU are going to be a serious factor with the relativly hi comp bottom end.


Terra, you sure about the M62 ? keen to see this done, you got linkage to anyone thats done it before ?????/, from the curves i looked at it didnt look like a good fit on a 4A inlet temps looked waaaay high at the boost pressures i thought that would be a worthwile improvement over an SC12 /14 ie 14-17 PSI, tell us what you know.

[Mikey vee]

so Duk, you reckon small top mount or small front mount?? As i was saying in the previous posts, i was looking at getting rid of the sc14 and just getting the sc12..

Gun Metal, i do like the limiter , but ive found that the 20v's dont (ive already dropped a valve in the previous engine..) also i plan to buy stronger rods, and decomp pistons for the bottom end to compensate for the boost. The valves will remain the same size, although they will be stronger, and heavier valve springs. The ecu im not too worried about atm, just trying to get it together.. Also i like to be different, so this is why i decided to modify a 20v.

At the moment my mate is laser cutting a plate to customise the inlet, we spent a good 3-4 hours designing, and searching on the net, only thing is, i am in need of a set of velocity stacks to suit the 20v, whether they are old or new, meh, im going to cut them and modify to suit the new design plenum...

[Sam_Q]

boost should not wreck rods, infact during the compression stroke it reduces the force on them

[BenAw11]

plus dont you have a silvertop they have the same rods as the gze from memory so it will be fine.

[GUN METAL]

mmmm ok well if you are opening it up then go for broke !

i still think go for hi comp tho, oh and whack on the SC14 if you are going to this much trouble or even a better SC

as for rods i am pretty sure 20v are different to GZE but it may be year model dependant

[Hiro]

It's not really that the silvertop has the same rods as the GZE, more that the late-model GZEs have the same rods as the silvertop.

General rule of thumb is that the GZEs have the same rods as their equivalent year/model 4AGE. So bigport GZEs have bigport rods, early smallport GZEs have smallport rods, and late smallport GZEs have silvertop rods.

[oldcorollas]

infact during the compression stroke it reduces the force on them

how does that work?

[trdee]

piston rings/ringlands/etc will go long before your rods will anyway.

[Harreh]

boost should not wreck rods, infact during the compression stroke it reduces the force on them

[Sam_Q]

haha that's funny as, because on a thick rod there isn't enough compressive force to give any meaningfull bending issues so it's only fatigue that would cause one to fail which would be from stretching with revs. With a higher boost it dampens the stretching of the rod due to offsetting the inertia and therefore reducing the stress. This is why a thick rod is under the most load during valve overlap instead of during the compression stroke. I think it was Corky bell who wrote about this, hard to remember

[Sam_Q]

At the moment my mate is laser cutting a plate to customise the inlet, we spent a good 3-4 hours designing, and searching on the net, only thing is, i am in need of a set of velocity stacks to suit the 20v, whether they are old or new, meh, im going to cut them and modify to suit the new design plenum...

so your just looking for stacks without flanges? because I have masses of them

[SHEPPO3930]

Rotrex superchargerd Striker kit car - dyno - YouTube

a bloke with a stock compression silvertop 20v with a Rotrex supercharger, 14psi made like 200kw at the wheels and he ended up doing a year or more of motorsport. the motor only died when he raised the rev limit (= more boost), and it detonated and cracked the ring lands. when it was rebuilt he used 4agze pistons and had them fly cut to suit the 20v valves.

but... no, HUGE BUT!! - this was with a Rotrex blower. they make boost linear to revs (simply speaking). so it only saw max boost at max revs. it's more gentle than a turbo which can make max boost almost anywhere depending on load.

[Sam_Q]

that video is of a blacktop?

well whatever he did 200kw is outstanding

[SHEPPO3930]

it's running silvertop internals - here is a shot of the broken piston & rod out of that motor: http://www.locostbuilders.co.uk/gall...ked_piston.JPG it's most definately silvertop. probably just be running black top cam covers, cause they look heaps better than the silvertop ones.