4k Camshaft

[rockinrolla]

I have been building an engine for my sons first car (KE20) so far I have balanced the 4K bottom end, 3k big port head, factory twin carbies, extractors and a 2 inch sports exhaust, with a 5 speed, the car will be spending a lot of time on the highway so 2500rpm upwards will be the starting point and hopefully it wont be going past 7000rpm to often, but boys being boys he'll give it his best shot, but does anyone out there have any good ideas of what profile to use of where to find out. :D :) :) :hmm: :hmm: :hmm:

[Guest Sbox]

Deleted

Edited May 24, 2008 by Sbox

[irokin]

http://www.tighecams.com.au/COROLLA3K.htm

 

Good place to start :D

[rockinrolla]

thanks for that, I'll give them ago, the local guys said they couldn't help and to contact some mailand cam companies, it looks like that may be my only option, thanks for the address.

[coln72]

Wade 169 profile worked well in a 5K with similar mods.

[old corolla bloke]

i used a bert jones 30/70 with good results in a 4k reasonable low end and more top end than the standard twin carbs could deliver

 

cheers

 

brian

[rolla_boy70]

609 cam grind good for that kind rev range

[kangaroosa]

I just dropped 2 cams of to 'Wade Cams' yesterday to try in my car. I got the 240 and the 140-6 grinds.

 

Profile Actuation Make/Model R/Ratio

140-6 Flat Tappet Toyota Corolla 3k-4k In1.5 Ex 1.5

--------------------------------------------------------------------------

Cam Lift Duration Duration Valve Valve Cam Lift Phase

Adv @050 Clr Lift tdc <)

--------------------------------------------------------------------------

Intake 296 291 238 0.013 0.4305 096 106

Exhaust 297 296 238 0.013 0.432 078

--------------------------------------------------------------------------

 

Timing Timing

Adv @050

Open Close Open Close

Exhaust 74.5 41 47.5 10.5

Intake 40.5 70.5 15 42.5

 

82 26

Deg Over-lap Deg Over-lap

 

 

-------------------------------------------------------------------------------------------------

 

Profile Actuation Make/Model R/Ratio

240 Flat Tappet Toyota Corolla 3k-4k In1.5 Ex 1.5

--------------------------------------------------------------------------

Cam Lift Duration Duration Valve Valve Cam Lift Phase

Adv @050 Clr Lift tdc <)

--------------------------------------------------------------------------

Intake 283 282 220 0.017 0.4072 054 109.5

Exhaust 283 280 220 0.017 0.4072

--------------------------------------------------------------------------

 

Timing Timing

Adv @050

Open Close Open Close

Exhaust 71 29 41 -1.5

Intake 32 70.5 1.5 38

 

61 0

Deg Over-lap Deg Over-lap

[Felix]

For best power between 2500-7000 rpm in a 4k I'd look at a cam around 256-260 degrees duration.

 

Keep in mind that a 4k's powerband will be about 1000 rpms higher for a given cam, compared to running the same cam in a 5k. So if someone says my cam will pull hard from 3500-7500 in a 5k, it will more than likely work from 4500-8500 in a 4k.

[rockinrolla]

For best power between 2500-7000 rpm in a 4k I'd look at a cam around 256-260 degrees duration.

 

Keep in mind that a 4k's powerband will be about 1000 rpms higher for a given cam, compared to running the same cam in a 5k. So if someone says my cam will pull hard from 3500-7500 in a 5k, it will more than likely work from 4500-8500 in a 4k.

Sorry I havn't replied earlier but all the information was fantastic, I went and located a 5K and pulled it apart and tried a lot of things and found the best set up and another test car to put it in so I could compare the results, I have scince told my son that he will eventually have the 5K and 5 speed but will have to learn in the 4K and 5 speed single carb version as I'm having to much fun. Thank You to everyone for all of the information, I'm having an absolute ball. :jamie: :P :) :lolcry: :lolcry: :lolcry: :lolcry: :lolcry: :jamie: :jamie: :jamie:

[kangaroosa]

Just to add to my previous post....I have since changed back to the Wade 240 grind and personally i think its the best suited cam i have had so far. The 140-6 was waaay to big, and i had to rev the guts out of it, to make it move.

Just something to think about when you get the 5K up and running.

Edited December 4, 2007 by kangaroosa