Problems faced with rev'ing over 8k rpm...

[Barron]

Looking at new spec.

Like the idea of Catcam 423's but they would require a redline over 8k to get the best from them.

Obviously i would go for:
High comp pistons
Uprated conrods
valve springs
vernier pulleys (delete VVT)
uprated bottom end bearings

over 8k the hydraulic lifters become an issue ive heard, has anyone ever done a conversion to solid lifters?

what other problems could i face? standard crank not up to job?

thanks
carl

 

[Fred@BTM]

do you know how much solids cost!

 

[Barron]

do you know how much solids cost!

i have no idea! or no idea who supplys them lol

 

[Fred@BTM]

from memory it'll cost you about the same as a decent 182

 

[ben_p]

Sodemio (sp) do a solid head for about 4-5k iirc?

 

[ben_p]

PS barron my engine my engine may be forsale.

 

[Barron]

PS barron my engine my engine may be forsale.

broken it already? eesh

 

[ben_p]

no lol, ive bought a S1 exige so may brake the car

 

[Russ_16v]

no lol, ive bought a S1 exige so may brake the car

Jeeezus you need to give me some of your money you have to much lol

 

[geesus69]

3rd from the botton, buy it, fit it, job done

http://www.touringcarspares.com/part_list.php?cat=eng

no lol, ive bought a S1 exige so may brake the car

you boy, are something else! :approve:

 

[Mark One]

do you know how much solids cost!

surely if they are that bad they could be custom machined? Would the rollers die of death if you just put a solid support in there?

 

[stan*]

You can convert them easy enough on the f4r's, take one apart and machine some bar to fit inside.

Solids for direct to tappet engines like the F7R are £28 each!

Crank will be fine.

 

[Barron]

You can convert them easy enough on the f4r's, take one apart and machine some bar to fit inside.

Solids for direct to tappet engines like the F7R are £28 each!

Crank will be fine.

what else could be a problem with rev'ing to say 8300k rpm?

carl

 

[stan*]

You would want to investigate the durability of the rockers.
I'd fit a paddle clutch, I dont like taking standard ones past 8000rpm at a push.

Make sure the rods and particulalry the bolts are decent quality.

Make sure your oil supply is adequate, increased rpm requires higher pressure. if you concentrate on getting your crank clearances right, you shouldnt have any problems on the std oil pump.

im building a similar/higher spec F4R over the next couple of months, so feel free to keep in contact for any info.

 

[Barron]

You would want to investigate the durability of the rockers.
I'd fit a paddle clutch, I dont like taking standard ones past 8000rpm at a push.

Make sure the rods and particulalry the bolts are decent quality.

Make sure your oil supply is adequate, increased rpm requires higher pressure. if you concentrate on getting your crank clearances right, you shouldnt have any problems on the std oil pump.

im building a similar/higher spec F4R over the next couple of months, so feel free to keep in contact for any info.

ok padel clutch needed then

what make rods/pistons are you using or would you recommend?

for pressure i will block the oil squirts under the pistons. Any other ways to help with pressure?

add me on msn if you fancy mate: b_b_w_s@hotmail.com

carl

 

[stan*]

flywheel bolts and fitting a shear-pin to the flywheel were two other things which popped into my head just now!

Added.

 

[ben_p]

You dont need to rev to 8300 with 423s dude

They peak at like 7700

 

[Barron]

You dont need to rev to 8300 with 423s dude

They peak at like 7700

Oh really? Nice :-D so why don't people go for 423s?

Carl

 

[Fred@BTM]

you can do 240bhp on schricks with a 7700rpm limit

 

[sideways danny]

You dont need to rev to 8300 with 423s dude

They peak at like 7700

?? who said that? I've seen 422s peak higher than that

 

[ben_p]

When I spoke to QEP he said 422s peak at 7500 and 423 at 7700?

I didnt go for 423 incase I threw a rod at 8000 lol

 

[sideways danny]

depends on other spec really. I'd always want rods wih 422s personally. They like revs