Hi, I have just had my escort cosworth motor stripped and have a few questions regarding a good spec for 500bhp.
What is the std crank good for?
For 500 bhp should I consider longer rods and if so who's?
What port dimensions are required for the head inlet & exhaust?
What cams will suit?
Can I get away with valves but any benefit by changing?
Solid followers?.
Compression ratio?.

The block and head have been soda blasted ready and I have somebody to build the motor and have the head work done, but would like a couple of opinions as I don't want to re-invent the wheel.
Any other good advice would be good.
Thanks in advance.

 

standard crank 500+bhp ALL day long!

 

Jenspeed has a std crank in his escort with 800bhp

 

Standard rods and crank will do 500 bhp no problems

 

Get the message loud and clear.. Saves a few quid there then... What about the rest?

 

speak to who you are going to use for the map or chip they will advise you on compression ratio cams etc

 

depends on whos doing the work as different engine builders have their own idea on what combinations work.

ring one company and take their advice on all you questions, this way your going to get things that work

jim

 

i think i speak for most people mate when i say how longs a peice of string ,
you could ask 5 different tuners what they would spec for 500 hp , and i gaurentee they will all have there own ways /spec of achiveing it ,


best advice is consult them , find one that explains there price , and comes with a good reputation ,

and spend your money with them ,

if your capeable of building it , consult them or whover you plan to map it ,

but remeber theres not likely to be a gaurentee when you built it yourself



good luck with it

beef

 

arrgh jimbo you twat !!

stop typing faster than me lol

beef

 

Good Advice.

 

sorry ha ha

 

You realy need to take advice from the engine biulder/tuner/mapper doing this biuld,
I would use standard compresion,
Standard Rods unless uou want to use 8mm longer tech these are better and stronger,
Head work 26mm works well if the head man knows what he is doing,
Cams can use standard lifters unless you want to keep reving the nuts off it,
Standard valves are fine,
On a good biuld I would see 500hp and between 480ftlb and 500ftlb on a top spec engine.

Mark

 

Thanks for all the replies, the guy building the motor in currently stripping/rebuilding an 80's 3 door touring car motor for a customer (ex andy rouse car) and will be inerested to see what comes of that, but it seems that things have changed since back then (although it was producing big power it was at a massive cost) and so wanted to have a good idea of a current spec motor verses the 80's way. He has someone lined up to do the head work and had provisional dimensions for 25 inlet and 24 exhaust along with std valves to flow 150 cfm per cylinder (can't be sure of the units quoted). The current valves have seen 60k, will they be ok to use or will fresh one be required?. From his experience he recomended longer rods to reduce forces on the walls of the cylinder and reduced load on the crank, and also has some JE pistons from a previous rs500 project for a good price. Any rod recomendations?