4age 20v + supercharger

[old_mr2]

that vid makes me warm in the pants.

[Mikey vee]

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

well yes, although i was just thinking about it, as i am going to cut them, i am in need of smaller ones... think about it, the stacks might start off at like 50mm at base, but then on the top with the lip, it ends up being around 65mm, so if i cut them, it will not match up to the throttle body size... you get what i mean? so if you got smaller ones, that your not in need of, throw them my way if you could!

[Sam_Q]

I have 50mm and 20mm. However I can get non tappered stacks made up.

[Mikey vee]

sam_q pm me

[Moppitt]

Thats a very clean piston. I think we know a part of the reason he could run so much boost and not have massive detonation problems. It illustrates the inherent risk in boosting unknown engines - you just dont know the history of it. Thats not a problem in this case but I don't have much to add to the thread beyond that...

Sheppo: do you have the link for his locost build thread?

[SHEPPO3930]

sorry, don't have any links on this PC. maybe when i get home i'll have a dig around.

[Sam_Q]

I made the assumption it was a blacktop because he mentioned 45mm throttles. I also agree that's an amazingly clean piston.

From what I hear tuning with superchargers is a good thing due to their linear boost vs revs relationship. Their predictable nature makes it good to tune and avoid detonation.

[GUN METAL]

Wish that vid had a curve for the boost pressure............actually maybe the second curve is, or is that torque ?

Cause as for the pressure of 14 psi i asume that peak pressre, reall pity these rotrex things make no boost at low RPM

need to do some more reasearch.................................

[oldeskewltoy]

Orion Engineered Motorwerks in the USA had done some flowbench work on the various 4AGE heads. One thing that was VERY interesting is the 20V head flowed far more at lower lifts, while @ higher lifts, the 16V smallport flowed BETTER!. As I see this, the 20V blacktop is a PERFECT candidate for running a S/C to maximise the lower lift flow.

My mythical S/C "A" would begin with a 7A block and crank, I'd replace the rods, replace the pistons, bolt on a mildly ported 20V blacktop head, grind up a custom set of cams(212 @ .050" 9.5mm lift), dump the VVT, add in an SC14(or similar volume twinscrew) run it up to about 10-12 psi. As I see it, this should plant about 190#/ft @ about 2600 rpm... and just go up from there.... 230-250 max?? 190-230#/ft in a 1.8 is pretty much a significant stump puller if you ask me

[SHEPPO3930]

Here's the only thread I can find after some quick searching. A lot of the pics have been deleted tho.

Supercharged 4AGE 20V

[oldeskewltoy]

Here's the only thread I can find after some quick searching. A lot of the pics have been deleted tho.

Supercharged 4AGE 20V

bimbleuk - is the same guy who posted up on club4AG about 4 years back...

Club4AG Forum Topics: 4AGE 20V Silvertop + Rotrex c30-94 equals.....
Club4AG Forum Topics: Rotrex SC dyno video
Club4AG Forum Topics: Another Rotrex dyno plot - stock ST 20V
Club4AG Forum Topics: 20V + Rotrex + GZE pistons

[Moppitt]

Cheers! I've trawled through pretty much all his threads (and even threads hes posted in once or twice). Its an interesting set up and he makes some interesting points about tuning with a rotrex (ie that its easier and safer because of the way it builds boost with revs, not all in a lump), it would be interesting to see other views on that too.

[Duk]

Its an interesting set up and he makes some interesting points about tuning with a rotrex (ie that its easier and safer because of the way it builds boost with revs, not all in a lump), it would be interesting to see other views on that too.

I've always interpreted the tuning requirements like that, too. 1 benefit of supercharging over turbocharging is the lower pumping losses and better flow out the exhaust. This should help to keep the exhaust valves and that side of the combustion chamber cooler. That should make the engine a bit less prone to knock when on boost.

I am also going to mention that people shouldn't try and compare different style of PD superchargers based on displacement volumes. Trying to compare an SC14 with a similar capacity twin screw, is like comparing a Holden 186 to a 2JZGE just 'cause they have a similar capacity.

[oldeskewltoy]

I am also going to mention that people shouldn't try and compare different style of PD superchargers based on displacement volumes. Trying to compare an SC14 with a similar capacity twin screw, is like comparing a Holden 186 to a 2JZGE just 'cause they have a similar capacity.

thank you for being gentle.......

having only spent a short time on research, what I THINK I know about S/C is twinscrew = large torque curve earlier. Most turbo type S/C = more a turbo type torque curve. Rotrex(planetary gear drive turbo type) = somewhere in between

[Duk]

thank you for being gentle.......

having only spent a short time on research, what I THINK I know about S/C is twinscrew = large torque curve earlier. Most turbo type S/C = more a turbo type torque curve. Rotrex(planetary gear drive turbo type) = somewhere in between

I'm not sure if you are being sarcastic or not here.
I wasn't suggesting to try and compare a positive displacement twin twin screw supercharger with a centrifugal supercharger (Years ago, RonRob on here was building a twin screw kit for the 4AGZE and he spoke of 200RWKW and OODLES of low rpm torque). What I had said was that comparing the SC14 Toyota positive displacement supercharger to a similar capacity, positive displacement twin screw supercharger (wouldn't you know it, Lysholm has 1 either side of 1400cc) is just not fare to the old straight 2 lobe SC. They are worlds apart in technology and performance.