The V8 Owners Forum -

Please explain....
febr 05 you had 428.3 bhp
Febr 19, later on, you had 418.4 bhp

correction factor 100.8% ???

Time to think about transmission and diff oil coolers if not already fitted thats a lot if heat to remove.

OK 5th Feb is when they first had the car on the dyno. Then they had problems which resulted in an injector being sent back for tests. Injector re fitted then power runs on 19th Feb. Presumably the 11bhp difference is down to temperature and barometric pressure difference?????
Looking back at all my dyno sheets from previous years the correction factor ranges from 99% to 105%
What ever that all means?
Also transmission losses vary from 55.2 to 47.8 bhp
Numbers actually don't really mean that much but one thing I can tell you is that it is bloody fast now .

mgbloke wrote:Presumably the 11bhp difference is down to temperature and barometric pressure difference?????
Looking back at all my dyno sheets from previous years the correction factor ranges from 99% to 105%
What ever that all means?

Warmer air is less dense, so you will have lowered cylinder filling as the temperature rises.
Lower barometric pressure means there is effectively less air pressure outside and that lowers the pressure gradient between outside and inside the cylinder as it is filling.

Some special mod´s for my old home made stage 4 head´s..
Still running 43mm inlet valve.. In the pickture 38mm exhaust valve is deep in the inlet port..

timo,

looks like a lot of work!!!
How close are you to the water ways?
I was looking at some superb porting on a rover head at Lloyds when I had the flow tests done. looks like they went too close ending in failure after so much work.
hope yours turn out OK. Let us know the results.

mark

My new headers are nearly finished,

"Hemi" Headed custom Rover V8.. Made in Finland..

Why?
Mike

Because moreless 100bhp/litre output in orginal engine with those heads.

Hi
but I can do that and more with a 5.7 hemi crate engine and a cam for vastly less money. I can and do do that with a small block Chevy and a set of £1300 heads and a £1400 all forged bottom end kit with a roller cam. A stock 5.3 ls chevy and an LS3 cam a set of headers and a reprogrammed stock ECU. I can't see why you would start with the rover where you will have to have pretty well everything custom made for it to stay together, crank rods pistons will have to be custom made or modified chevy, the block will have to be top hat lined and have a brace made the list goes on, Personally I don't get it.
have fun
Mike
Ps wouldn't it make more sense to copy the engines made by March in the '70s with the inlet port moved to directly above the inlet valve, much less work than this and can use a modified stock casting.

Yes. But our stupid law won´t let us to use chevy engine´s in our car´s..
So we have to use Rover engine´s and try to tune them..
This is the only reason why we build those..

Too mutch cubic inches or too mutch power for chevy engine´s..
We can build approx 25% bigger engine in our cars.. But chevy 302cid vs 215cid is way too big..

Hi
"Yes. But our stupid law won´t let us to use chevy engine´s in our car´s.. "

Ok that I can understand that now so yes that makes more sense to me now 270 cu inch is not a lot to play with. . . .
best regards
Mike

Currently our law dicates that engine size may be increase 25 % and power may increase 20 % compared to the most powerful engine within the model range. No limits to torque increase apoart from that the rest of the driveline must match the increase. It´s our DoT office that determines what is within the model range.

E.g. Ford Cortina (UK) and Ford Taunus (Germany) are not in the same model range.

But the "good news" is that things are about to change. The current proposition for the new law states that there will no longer be a limit for engine size but instead there will be limits for engine power AND torque.
Now, take that low hp 302 or 305 or even 350 with a lowly 150 hp or something. Stick it in a euro soapbox with about 130-150 hp from factory. The limiting factor in the future will be the torque, not the engine size... Someone at the legislation side has been very clever

minorv8 wrote: Someone at the legislation side has been very clever

That HAS TO BE a world first......