56 replies to this topic

[Exmantaa]

[

Would be very hard to support somthing like that you need to keep the mass as close to the block as possible. I was thinking more along the lines of junking the current alternator and fitting somthing smaller (and more apropriate for the VX's current drain) above the SC

Unfortunaly I couldn't take the data with me when I left but I know the ball park figures

It makes a nice change from what wheels/exhaust/brake pads (delete as appropriate) should I fit or how to chav up and completly miss the point of a VX/elise, that T&M has turning into over the last couple of years.

may take you up on that and come with my laptop and calipers to to look at how to package things

Still helpfull if you can explain those ball park figures about the manifold bottle neck a bit more.

Off course that sketch was just something to visualize the idea. It will need some daft engineering / trial&error to pack and support everything properly and also maintain a half-decent belt layout. Soon I have my spare LSJ block standing in the garage, so I can trial fit some things like above. (f.i. my Harrop. )

[siztenboots]

don't suppose anyone has solidworks models of the engine bay / chassis?

[alanoo]

And why not the easy way ? A Rotrex, a saab inlet manifold, an uprated VXT intercooler...

[VX-GT]

And why not the easy way ?
A Rotrex, a saab inlet manifold, an uprated VXT intercooler...

You are reading my mind ref rotrex
as long as fitted to a LSJ engine (assuming regs allow)

[Exmantaa]

And why not the easy way ?
A Rotrex, a saab inlet manifold, an uprated VXT intercooler...

Looked around for a cheap C30/64, but not many 2nd hand. Then I found a cheap Harrop.

Edited by Exmantaa, 07 October 2010 - 02:53 PM.

[VX-GT]

And why not the easy way ?
A Rotrex, a saab inlet manifold, an uprated VXT intercooler...

Looked around for a cheap C30/64, but not many 2nd hand. Then I found a cheap Harrop.

I am thinking C38 range (larger volume lower pressure) but charge velocity could be an issue
Still early days

Edited by atom x, 07 October 2010 - 03:40 PM.

[slindborg]

And why not the easy way ?
A Rotrex, a saab inlet manifold, an uprated VXT intercooler...

You are reading my mind ref rotrex
as long as fitted to a LSJ engine (assuming regs allow)

They only ever had the Heaton fitted from factory

I think you maybe hard pushed to find any OEM that uses a rotrex as std :s

[techieboy]

They only ever had the Heaton fitted from factory

I think you maybe hard pushed to find any OEM that uses a rotrex as std :s

Regs, as I interpret them, don't say you can't move from a roots to a centrifugal supercharger, as long as the engine was initially supercharged.

20.3.2 The replacement of a supercharger or turbocharger not complying with the original system is
eligible, for example a Garret turbocharger can be replaced by a KKK turbocharger.

[VX-GT]

And why not the easy way ?
A Rotrex, a saab inlet manifold, an uprated VXT intercooler...

You are reading my mind ref rotrex
as long as fitted to a LSJ engine (assuming regs allow)

They only ever had the Heaton fitted from factory

I think you maybe hard pushed to find any OEM that uses a rotrex as std :s

Sorry for the confusion
If I am allowed to use LSJ as the core engine I would swop out charger for a rotrex

[Winstar]

And why not the easy way ?
A Rotrex, a saab inlet manifold, an uprated VXT intercooler...

You are reading my mind ref rotrex
as long as fitted to a LSJ engine (assuming regs allow)

They only ever had the Heaton fitted from factory

I think you maybe hard pushed to find any OEM that uses a rotrex as std :s

The way I read it then as long as it's mechanically driven then it is ok as it doesn't state which type of compression method need to be used, more shades of grey

[siztenboots]

don't think any of the honda's had a supercharger , so how the Lotus guys get an exemption is interesting

[VX-GT]

don't think any of the honda's had a supercharger , so how the Lotus guys get an exemption is interesting

Lotus CAN use honda (I assume historic exception's stand) but they use toyots 2zz-ge with same (as lsj) eaton SC

honda use jackson chargers,but unsure if factory fitted

[alanoo]

Never factory fitted on Hondas

[FLD]

I had considered making some sort of mounting to fit the supercharger down near the sump (AC position) and running an intercooler up. My concern was getting enough cooling in the gap between alternator and oil filter by conventional radiator style chargecooler. Seemed a bit more than I wanted to get into so it strayed from my mind.

[VX-GT]

Never factory fitted on Hondas

I agree, But Ariel Atom 300 has SC'ed Honda and that is a production car.

We are coming up with a few assumptions that all aid the support of any future arguement regarding USE of LSJ in VX220 in britcar

Edited by atom x, 07 October 2010 - 05:14 PM.

[VX-GT]

I had considered making some sort of mounting to fit the supercharger down near the sump (AC position) and running an intercooler up. My concern was getting enough cooling in the gap between alternator and oil filter by conventional radiator style chargecooler. Seemed a bit more than I wanted to get into so it strayed from my mind.

I assume the supercharger is a rotrex?

[VX-GT]

I have a saab block with darton liners bored to 89mm
steel crank de-stroked to 78.15mm
I am thinking of building a high power core engine combined with an eaton/harrop with LS4 TB
I believe there are a fair few SC's out there
But what about a high revving units

RPM@25m/s
standard SE (94.6MM) = 7928
standard LSJ/SAAB (86MM) = 8722
special steel (78.15mm) = 9599

Would I be wise going for
1 litre eaton SC with smaller pulley
or
1.3 litre harrop SC with larger pulley

switching to the smaller crank, what are your rod / stroke ratios like now?

my build will be based on saab b204 which has much earlier stronger crank and internals with stroke 78mm and rod length 153mm. Those crazy swedes Jonas at Maptun runs these upto 10k, with 78 mm stroke and 10000 rpm it would be 5118 feet per minute or 26 meters per second.

Saab B204 78mm 153mm 1.96:1

Dear siztenboots

I would like to know more about the B204 internals
any chance of meeting up