Supercharged RV8
Discussion
Planning to purchase a V8 RR shortly to install an SC Power Supercharger system as specified for TVR's(www.sc-power.co.uk), the spec being suitably adjusted to optimise the power requirement for the RR. Plenum top will need to be the alloy classic unit and I assume all engines whether Gems or 14CUX based can be converted to use this plenum top. Thinking about the 4.5 unit as it is pretty strong, the engine being crossbolted. Can any one advise the compression ratios used throughout the petrol engine range or provide advice which variant to build?
CHGRIFF said:
Planning to purchase a V8 RR shortly to install an SC Power Supercharger system as specified for TVR's(www.sc-power.co.uk), the spec being suitably adjusted to optimise the power requirement for the RR. Plenum top will need to be the alloy classic unit and I assume all engines whether Gems or 14CUX based can be converted to use this plenum top. Thinking about the 4.5 unit as it is pretty strong, the engine being crossbolted. Can any one advise the compression ratios used throughout the petrol engine range or provide advice which variant to build?
How much power are you after?Carb SD1 motors ran 9.35:1 Cr I think, don't know about EFI motors. On 99 RON fuel I'd have though this not a bad CR for a blower setup.
Hi,
there were compression ratios ranging from 8.13:1 to 10.5:1 depending upon variant. 8.13:1 CR pistons were used as stock in 3.5 and 3.9 engines (3.9 bore also common to "4.0" and 4.2 engines).
Probably best to go for a 4.0 engine (cross-bolted as standard IIRC) and use 8.13 CR pistons with a light boost.
There is a thread on D-90.com regarding a 3.9 litre supercharged Ninety:
"I've been tooling around in the D90 for a bit now with the new Rimmer installed autorotor supercharger..When I picked it up in Colorado Springs ( I went directly to our cabin @ 7200 ft and them onto Durango for some 7k to 12k ft cruising.. At altitude the rig ( with 4.75's and 35" SSR's ) seemed to be at least as quick as the vehicle was when it was completely stock when at sea level ( IE: stock gearing and stock tires no blower )... This is good.... as the tires ( and altitude ) are a big drag...Once I got her home ( I live @ ~3k ft, but I'm on a mountain, and most surrounding areas are ~sea level ) A big difference here! At 3k feet I could pull out of a T intersection and bark the tires a bit ( big 35's )"
You might find more tech info here. Also there is Green V8S amongst others who posts good technical responses - perhaps you should try the "engines..." section?
100SRV
there were compression ratios ranging from 8.13:1 to 10.5:1 depending upon variant. 8.13:1 CR pistons were used as stock in 3.5 and 3.9 engines (3.9 bore also common to "4.0" and 4.2 engines).
Probably best to go for a 4.0 engine (cross-bolted as standard IIRC) and use 8.13 CR pistons with a light boost.
There is a thread on D-90.com regarding a 3.9 litre supercharged Ninety:
"I've been tooling around in the D90 for a bit now with the new Rimmer installed autorotor supercharger..When I picked it up in Colorado Springs ( I went directly to our cabin @ 7200 ft and them onto Durango for some 7k to 12k ft cruising.. At altitude the rig ( with 4.75's and 35" SSR's ) seemed to be at least as quick as the vehicle was when it was completely stock when at sea level ( IE: stock gearing and stock tires no blower )... This is good.... as the tires ( and altitude ) are a big drag...Once I got her home ( I live @ ~3k ft, but I'm on a mountain, and most surrounding areas are ~sea level ) A big difference here! At 3k feet I could pull out of a T intersection and bark the tires a bit ( big 35's )"
You might find more tech info here. Also there is Green V8S amongst others who posts good technical responses - perhaps you should try the "engines..." section?
100SRV
Thanks for your comments, TVR 4.0 and 4.5 litre engines also run 9.35 copmression ratio without issues, using an intercooler for higher powered units. Interesting to know the lower compression ratios of the small engine range. Generally the SC Power units increase power and torque by around 35-40% when set up for TVR, but with the weight of the vehicle being x2 a set up biased towards torque would be more beneficial. Nice place to live by the way.
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