Tough 4k

[Mitch-12]

ok i have a grand to spend will do everything myself what is the go for rebuilding a 4k in my price bracket any help would be great no i can't do an engine conversion as the class i race has rules lol so i need to stay with 4k thanks guys

[RainWarriorDregs]

read

 

http://www.rollaclub.com/faq/index.php?tit...a_tough_K_motor

[philbey]

some indicative prices

 

http://www.rollaclub.com/board/index.php?s...18984&st=15

[Mitch-12]

so.... what pistons and stuff fit i decided no budget f@$k it ill have a spend i need to know pistons rods anything where i can get more power I'm gonna use a holley 180 and put some extractors on heaps of head work pistons bearings double row timing chain.....the lot whats the go with a double row timing chain do they make them and oh btw a cam lol almost forgot but i got all that sorted and valve springs and that at the moment i need to know the best pistons... gonna use holden red motor valve springs and sink them down a bit its only gonna do 7000 so I'm gonna port the head do i need bigger valves? anyway jus anything that may help me thanks guys

[Evan G]

4k's come factory with double row timing chains

[Mitch-12]

4k's come factory with double row timing chains

thanks evan guys i found some mahle pistons that fit gonna be good

[Felix]

4k's come factory with double row timing chains

 

Bullshit. Pretty much all 4k's came from the factory with a single row timing chain. Think about it the motors are like 30 years old, most would have had a timing chain replaced in there lifetime, single and double row kits are freely available in the aftermarket... For the amount of effort required to replace a timing chain, most people opt to put a double row in to save the headf@$k of having to do it again in a few years.

 

3k's had a double row timing chain std.

[Felix]

If you are only going to rev it to 7 grand, there is no point replacing the valve springs or spending a heap on porting, or on bigger valves.

 

Pistons and rods don't make HP, they support it.

Edited April 20, 2010 by Felix

[Mitch-12]

If you are only going to rev it to 7 grand, there is no point replacing the valve springs or spending a heap on porting, or on bigger valves.

 

Pistons and rods don't make HP, they support it.

yes i know they do not make hp they make it easier on the motor yea i didnt think they had it stock I'm goin a pre big cam so i will need valve springs hence the double row timing chain I'm porting the head myself ...my dads a engine builder and i think ill leave stock size valves in

[Doogs]

Pistons and rods don't make HP, they support it.

 

Great point.

If you are wanting to increase power output, the biggest gains that can be made are in the top end.

Spend a bit of time and $ improving the ports and flow.

[abbott]

rather than being stupid and making another thread, what upgrades are need to put a better cam into a 5k?

[snot35]

How long is a piece of string?

[Felix]

rather than being stupid and making another thread, what upgrades are need to put a better cam into a 5k?

 

None if you stay hydraulic, and don't worry about a solid lifter conversion (which really gives minimal gains unless you plan on spending a lot of time over 8 grand).

[philbey]

so.... what pistons and stuff fit i decided no budget f@$k it ill have a spend i need to know pistons rods anything where i can get more power I'm gonna use a holley 180 and put some extractors on heaps of head work pistons bearings double row timing chain.....the lot whats the go with a double row timing chain do they make them and oh btw a cam lol almost forgot but i got all that sorted and valve springs and that at the moment i need to know the best pistons... gonna use holden red motor valve springs and sink them down a bit its only gonna do 7000 so I'm gonna port the head do i need bigger valves? anyway jus anything that may help me thanks guys

 

hey mitch. I'm running the mahle pistons in mine, you can go up to 60 thou oversize. They're about 160 a set. I'd forget rods, you probably don't need them and as felix said they don't make power.

 

if you are pulling the bottom end apart, get it balanced.

 

Porting yourself, sounds cool, post up plenty of pics! Probably a 3 angle valve grind will do, I know in a 5K you can't really get much bigger in valve size without serious work, dunno about a 4K.

 

Double row, as felix mentioned, is a maintenance thing, they last longer than single row chains.

 

Abbott, you should look at a bigger (than stock) carby and a set of extractors as a bare minimum. I ran a big lift cam (.480 lift) with stock springs, I got a year out of them before they broke, but I'd suggest a set of performance springs.

[Taz_Rx]

If you want to try and extract some extra power from the bottom end balance the hell out of everything like Philbey said.

Spool are now making 5k H beam rods for $595 a set. Don't see why you couldn't use them in a 5k.

 

BIG cam and <7000rpm doesn't really add up. :)

 

Oh and forget the 180 holley, there's so much better options out there! :dance: