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Forged rods...
- Thread starter ben_p
- Start date
Focus RS Mk1
it seems a lot now, payin £450, for somehting that youve already got and chances are will be ok. but its that part of you that wishes you shouldve gone for the forged rods...
while its apart you may aswell...bullet proof engine almost.
at least you know that if you up the anti later on with more mods the engine will be safe
while its apart you may aswell...bullet proof engine almost.
at least you know that if you up the anti later on with more mods the engine will be safe
Christopher
ClioSport Club Member
Z4M
I would dude
It'll not limit you if you ever decide to go further still, either
Going by your last effort, you don't do things by halves
It'll not limit you if you ever decide to go further still, either
Going by your last effort, you don't do things by halves
Well no, the cams are 428s
So I think peak power is around 7700-7800? no?
I just put 8k as a max! If the oem rods (with ARP big end bolts) will hold at that then thats good news..
I was going to change to 422's but i just cant be arsed spending the 700quid.. when the 428s are not that far off!
thoughts?
So I think peak power is around 7700-7800? no?
I just put 8k as a max! If the oem rods (with ARP big end bolts) will hold at that then thats good news..
I was going to change to 422's but i just cant be arsed spending the 700quid.. when the 428s are not that far off!
thoughts?
428's are fine. They will make power at 8000RPM but to be honest they are just over the top at 7800RPM IME with a fairly decent flat end to the power curve between 7450'ish and 7700rpm.
That 7800RPM isn't going to be sustained anyway as you aren't going to slam it into the rev limiter at the end of every gear so to be honest with you I'd save your money. Get a set of standard rods checked for roundness and crack tested, use good quality tri-metal big end bearings and ARP fasteners. That should see you fine for 7800RPM with reliability. It's worth noting a lot of standard cars with remaps are running around with 7800RPM limiters!
Are you still planning to raise the CR? How much power are you after?
Cheers
M
That 7800RPM isn't going to be sustained anyway as you aren't going to slam it into the rev limiter at the end of every gear so to be honest with you I'd save your money. Get a set of standard rods checked for roundness and crack tested, use good quality tri-metal big end bearings and ARP fasteners. That should see you fine for 7800RPM with reliability. It's worth noting a lot of standard cars with remaps are running around with 7800RPM limiters!
Are you still planning to raise the CR? How much power are you after?
Cheers
M
Barron
ClioSport Club Member
Turbo S,Exige,R5,182
422's tbh
Depends on the rolling road. ;-)
The rods are strong enough with sub 8K limits for that. Paul has been running 296bhp on them for months now.
With a well done cylinder head, 428's, high comp pistons and a healthy engine I'd expect to see 230bhp'ish. The other 10bhp would come from an extra 500rpm and some suitable cam profiles, but that involves new cams and steel rods as 8K is the absolute limit for standard rods IME if you want to ensure reliaiblity.
Don't go setting a power figure and chasing it - thats what marketing people make development engineers do ;-) Put a sensible package together for your budget that'll be reliaible and easy to maintain and build that. It'll make decent power either way and theres no point massively compromising engine life for the sake of 15bhp.
Cheers
M
The rods are strong enough with sub 8K limits for that. Paul has been running 296bhp on them for months now.
With a well done cylinder head, 428's, high comp pistons and a healthy engine I'd expect to see 230bhp'ish. The other 10bhp would come from an extra 500rpm and some suitable cam profiles, but that involves new cams and steel rods as 8K is the absolute limit for standard rods IME if you want to ensure reliaiblity.
Don't go setting a power figure and chasing it - thats what marketing people make development engineers do ;-) Put a sensible package together for your budget that'll be reliaible and easy to maintain and build that. It'll make decent power either way and theres no point massively compromising engine life for the sake of 15bhp.
Cheers
M
we did approx 240 on a stock bottom end, bar the rods being balanced, the entire assembly balanced, Wossner high comps, a head with a fair bit of work (currently for sale!) Schrick cams, and a bit of tinkering with the compression (higher), big injectors and a proper map
first time round the engine dyno'd (on an engine dyno) at 225bhp, then it s**t itself due to a problem with the honing
second build it was bang on, we changed to Total Seal rings, f**ked about with the compression a bit, and it pulled 205 @ wheels which going off the dyno cell V RR comparisons was approx 240
first time round the engine dyno'd (on an engine dyno) at 225bhp, then it s**t itself due to a problem with the honing
second build it was bang on, we changed to Total Seal rings, f**ked about with the compression a bit, and it pulled 205 @ wheels which going off the dyno cell V RR comparisons was approx 240
Barron
ClioSport Club Member
Turbo S,Exige,R5,182
I think I can make it there without the need for 422's
428s have good lift! plus the head will awesome! (im good with a nail file
428's
forged pistons
standard rods + ARP
uprated bottom end bearings
full balanced bottom end
flowed head
lightened flywheel
standard valves + springs?
decat and SS im supposing?
think that would make a proven 225-235 on pauls RR
Barron
ClioSport Club Member
Turbo S,Exige,R5,182
Barron
ClioSport Club Member
Turbo S,Exige,R5,182
Last edited:
428's
forged pistons
standard rods + ARP
uprated bottom end bearings
full balanced bottom end
flowed head
lightened flywheel
standard valves + springs?
decat and SS im supposing?
think that would make a proven 225-235 on pauls RR
Ive got
sports cat, which will be a de-cat
182 manifold (not sure if this is what i want tbh, it may be up for sale)
Standard valves and springs
Lightend flywheel
Got up rated bearings
got pistons
got ARPs
the head is a half arsed job, it needs work
the map is s**t lol.
Barron
ClioSport Club Member
Turbo S,Exige,R5,182
with decat and that spec (say a standard head) i would suspect 215-225
not sure how well 182 manifolds are with power figures on itbs
