discomark10
Well-Known Member
Might do when its all done. Need it running asap now. Not the end of the world.
jamesmartin
Well-Known Member
compression is done with the pistons
discomark10
Well-Known Member
What's the power on the 8cr and the 9cr
fett
Well-Known Member
well to give you an idea the 8:1 4.4 was 130 bhp and the 9.1:1 4.4 was 200 bhp so quite a difference- it surprised me. not sure if it would be so marked on the 3.5
my carb 3.5 is 8.25:1 and 135 bhp and that has the less efficient pre sd1 head (although they are the same volume and james is right as ususal its the pistons that change compression with std parts on the lrv8)
my carb 3.5 is 8.25:1 and 135 bhp and that has the less efficient pre sd1 head (although they are the same volume and james is right as ususal its the pistons that change compression with std parts on the lrv8)
discomark10
Well-Known Member
Had to take them all off and grade them loose to tight. Test fit, chenge if needed and made sure they all were good
fett
Well-Known Member
that sounds like a right pain, so long as the guy at the machine shop didnt take them off to press on the new pistons then mine should be ok still, I was so carefull.
what you gonna do about that lousy C/R , real steels said to me on wed that some rv8 versions only had 95 bhp- could that be yours? get some new pistons in there bud!
what you gonna do about that lousy C/R , real steels said to me on wed that some rv8 versions only had 95 bhp- could that be yours? get some new pistons in there bud!
jamesmartin
Well-Known Member
i presume you will be fitting caps and running your finger around the joints before fitting shells
discomark10
Well-Known Member
Yea it took many hour's!
I dont know.. bit ****ed off at the prospect of it only being 95bhp. Whats the bhp on the 9.1:1? The only bonus is the new 3.9 cam might add a couple over the 3.5 one
I dont know.. bit ****ed off at the prospect of it only being 95bhp. Whats the bhp on the 9.1:1? The only bonus is the new 3.9 cam might add a couple over the 3.5 one
discomark10
Well-Known Member
I did check them they all seemed good
jamesmartin
Well-Known Member
i meant fet before he fits his ,you can never take for granted they are right
fett
Well-Known Member
yeah I dunno if it was a disco one thats 95 but its about the lowest compression I have heard of on one lol. not sure on the 9.35:1 in a landy but the 9.75:1 in an sd1 was 190 bhp with single plenum I think.
if it makes you feel better some new old stock (ie good quality non third world pistons) cost me 270 all in. if you were happy to go for whatever rimmers or lr direct is selling for example I expect it would be even cheaper. you may as well while its in bits!
if it makes you feel better some new old stock (ie good quality non third world pistons) cost me 270 all in. if you were happy to go for whatever rimmers or lr direct is selling for example I expect it would be even cheaper. you may as well while its in bits!
jamesmartin
Well-Known Member
when you do ,also check rod is central in relation to pin and piston floats on pin
fett
Well-Known Member
will do boss, I was also wondering how much oil to put in the bore when putting the pistons in when I did the bmw's rings I just left what as in there as it didnt come out of the car or get bored but this is a complete build now so would like to know what you normally do mate
jamesmartin
Well-Known Member
i just wipe the bore with oily rag then oil the rings and grooves just before fitting
