83 replies to this topic

[vocky]

thats the shizzle adam!

now the question is can i hook that up to my m62?

(i can picture vocky shaking his head )

you would need to remove the m62 and fit a 2.4 inlet manifold for the rotrex

[The Batman]

can i not modify the inlet manifold for a hole in the bottom for twin superchargers?!

[vocky]

twin sc's

[The Batman]

[southpaw]

ot but what is the advantage of the rotrex £s/weight/bhp?

[The Batman]

you will have to wait until the guinea pig is finished

[mandarinvx]

ot but what is the advantage of the rotrex £s/weight/bhp?

I think the charger itself is more expensive, but money is saved on other aspects, overall may be cheaper

The 30 only weighs 5kg, if that's the one to be used, with no seperate cast manifold

No idea what BHP - the C30-74 is capable of 150-300bhp; the C30-84 is 200-320bhp; and the C30-94 is 250-400bhp. Tho the C30 is their off-the-shelf design, it may be possible to spec a custom one

[The Batman]

does anyone want a c30-94?

[Muncher]

Be patient and wait for the manifold to come in, it's worth the wait.

[fiveoclock]

Be patient and wait for the manifold to come in, it's worth the wait.

Thanks, thats exactly what I'll do, just hope its not too long.

[Winstar]

ot but what is the advantage of the rotrex £s/weight/bhp?

I think the charger itself is more expensive, but money is saved on other aspects, overall may be cheaper

The 30 only weighs 5kg, if that's the one to be used, with no seperate cast manifold

No idea what BHP - the C30-74 is capable of 150-300bhp; the C30-84 is 200-320bhp; and the C30-94 is 250-400bhp. Tho the C30 is their off-the-shelf design, it may be possible to spec a custom one

rotrex are centrfugal compressors* which means they are far more efficient than even a harrop so less parasitic loss and less cooling required. However they would only mak sense if you where either going make a cheap sc conversion that made 250 - 260 bhp without charge cooling or make a 400bhp monster using a C30-94 which has one of the best compressor designs available.

*they are actually Holset, my old company, compressor stages mated up with rotrex's epicyclic gearing.

[Retset]

I reckon a Rotrex aiming for 240bhp using just a side pod mounted intercooler should be just about perfect

[The Batman]

i thought the reason why courtenays scrapped the idea of side mounting a intercooler in the side pod was because it wasnt cooling it enough? i think a couple of vx's had this setup but was then scrapped for the charge cooler up front

[MMSB]

However they would only mak sense if you where either going make a cheap sc conversion that made 250 - 260 bhp without charge cooling or make a 400bhp monster using a C30-94 which has one of the best compressor designs available.

Can I ask why you would say that?

250-260 bhp would be more than enough for me, but I would think that with no chargecooler/intercooler you would only have that bhp for a short while, so no good for track driving, especially with high temperatures... Am I wrong?

[mandarinvx]

i thought the reason why courtenays scrapped the idea of side mounting a intercooler in the side pod was because it wasnt cooling it enough?

i think a couple of vx's had this setup but was then scrapped for the charge cooler up front

You may only need an oil cooler on a Rotrex setup, which could be side pod mounted

The Rotrex doesn't generate anywhere near as much heat as the GM / Harrop, so induction temps will be much lower anyhoo

[slindborg]

However they would only mak sense if you where either going make a cheap sc conversion that made 250 - 260 bhp without charge cooling or make a 400bhp monster using a C30-94 which has one of the best compressor designs available.

Can I ask why you would say that?

250-260 bhp would be more than enough for me, but I would think that with no chargecooler/intercooler you would only have that bhp for a short while, so no good for track driving, especially with high temperatures... Am I wrong?

I'd take Winstars advice rather well on that front
since the rotrex isnt a complete heat generator like the hEaton then charge temps arent such an issue so you dont need to cool that and can swing it with decent fuelling and timing.

[rcvaughan]

I hear there is already such an engine in a vx220

apparently it has a 7900rpm limiter on a high compression engine with webcon throttle bodies, running between 220 and 240 bhp depending which rolling road you believe

7900PRM!

[MMSB]

However they would only mak sense if you where either going make a cheap sc conversion that made 250 - 260 bhp without charge cooling or make a 400bhp monster using a C30-94 which has one of the best compressor designs available.

Can I ask why you would say that?

250-260 bhp would be more than enough for me, but I would think that with no chargecooler/intercooler you would only have that bhp for a short while, so no good for track driving, especially with high temperatures... Am I wrong?

I'd take Winstars advice rather well on that front
since the rotrex isnt a complete heat generator like the hEaton then charge temps arent such an issue so you dont need to cool that and can swing it with decent fuelling and timing.

Oh, I didn't mean too look like I was doubting his advise, I realise from his posts that he knows very well what he talks about!

My question was just because I am looking to get some more ou of my engine but want to track it, so a cheaper S/C setup would be perfect for me if it did "take the heat"

Courtenays themselves aknowledge that their Stage 1 conversion would not resist track use, hence my question...

[slindborg]

no where that I know of has a rotrexed VX on the road as yet. I'm sure there are a few in the pipeline though as its pretty much a DUHHHHHHHHH option over the hEaton. So it wont be a simple drive in drive out option at the "tuners" yet.

[Muncher]

How would the boost and torque graphs differ between an M62/Harrop and a Rotrex? I was led to believe the power delivery/driveablity characteristics were not as good on a Rotrex charger.