Racing Cam Profile, Anybody?

[badbuddyz]

Anybody out there, Help!!!!!!

i just changed my vr4 head to a vr4 rs head. just thinking of a mini project, modification of cam. anybody with racing cam profile? that i can compare with stock vr4 with any performance racing cam?

i hv access with all the machining part. the problem is i cant found any cam profile in the net :( ....HELP!!!!!!!

 

[fct]

vr4 rs(eci) cam is slightly higher than the vr4 cyclone cam.same with e1,2 cam.i think around 250.

 

[badbuddyz]

actually i m thinking of regrind the standard vr4 cam to make the cam profile similar to racing cam. this project maybe a failure or success. we couldnt know. i need the cam profile to study the angles and regrind the standard cam. just an experiment....


HELP!!!!!!!!!!!!!

 

[flushafteruse]

this may can help u............

Cams Tested:
Stock Mitsubishi
Web Cams - Street Grind
HKS 264 intake 264 Exhaust
HKS 264 intake 272 Exhaust
HKS 272 intake 272 Exhaust
Crower - Stage 3 Grind
Jun Stage 3 Grind

Peak Horsepower and Torque Results:

Stock Mitsubishi Camshafts:
Peak HP: 309.5
Peak TRQ: 295.3
Spool up on street: quick, full boost by 3.2K RPM in 3rd gear with good power when off boost and as it's coming onto boost.

Web Cams - Street Grind:
Peak HP: 314.3
Peak TRQ: 295.3
Spool up on street: slower than stock, full boost by 3.4K RPM in 3rd gear with less power off boost than stock cams.

Crower - Stage 3 Grind
Peak HP: 322.6
Peak TRQ: 314.0
Spool up on street: much slower than stock (the worst of all the cams) with full boost hitting by 3.6-3.7K RPM and a definite loss in power off boost compared to stock cams.

Jun Stage 3 Grind
Peak HP: 323.7
Peak TRQ: 323.2
Spool up on street: Car was not driven on the street.

HKS 264 Intake 264 Exhaust
Peak HP: 323.1
Peak TRQ: 333.0
Spool up on street: As good as stock (3.2K RPM), with off boost power the same if not better than stock.

HKS 264 Intake 272 Exhaust
Peak HP: 324.2
Peak TRQ: 333.1
Spool up on street: Slightly slower than stock (3.3K RPM in 3rd gear) and a very slight loss in power in off boost conditions.

HKS 272 Intake 272 Exhaust
Peak HP: 325.2
Peak TRQ: 323.4
Spool up on street: Slower than stock, full boost by 3.4K RPM in 3rd gear with a slight loss in power in off boost conditions.

 

[flushafteruse]

i'm now using custom made stock evo cams with hks 272 duration profile...quite sluggy in low end but when boost comes in 3.8rpm can feel until end at redline..

 

[flamefox850]

errr i want to ask about regrind cam. as i know, they usually regrind the cam base circle to make the cam nose higher and has more duration.

but the base circle is the one that touch the rocker arm right ? how they install it ah ? if the base circle become smaller...still it touch the rocker arm or is it hanging ? or need any modification to the rocker arm ?

 

[V8_nutter]

It will be hanging,,then we cover it back with washer to get back the lift:regular_smile:

 

[flamefox850]

ic. thx bro

 

[flushafteruse]

yup,must tap a washer to cover up the lifter

 

[flamefox850]

if use that washer to the rocker arm...is the engine realiable enough to be daily driven ?