Been asked by a mate for a bit of help.....

He has an RS2000........ not a proper one, its a Mk5 Escort

Anyhoo, he is putting the 2.3 Galaxy bottom end on it and apparently the 2000 head and 2.3 bottom end together gives a CR of 11.8:1.
According to him he has looked in to it a little and the standard 2000 and the 2.3 both have a CR of 10.5:1 and he would like to drop the CR of the engine he's putting together to around the standard figure or something slightly higher than standard as he has heard stories of the 11.8:1 engines not lasting long.

Is there some sort of calculation/formula or whatever that can be done to work out how much extra volume in the chamber is needed to reduce the CR to his target figures???

Thankyou Please

 

just measure the volume of the 2.0 head and 2.3 head and would see the difference surely if he just wants it back to the same as standard?

But anyway the formula is

(unswept + swept) / unswept

 

Cheers Chip.

He now saying that the 11.8:1 motors are ok, its just him being a fanny and thinking it will blow up at that CR

 

Why doesn't he fit the complete engine then?
They don't just blow up in the Galaxy's

 

Supposedly the 2k head flows better. I havent looked into it myself so dunno what the score is.

Forgot to text you back the other day too mate. Cant be doin with workin in seedy back street garages workin on the floor no more, but cheers anyway.