Tough 4k

[Doogs]

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:

 

Thanks Si, good to know about those rods. (My budget will decide whether I can use them though lol)

For a good carbie setup that does not cost as much a DCOE Webers I'd be going for SUs. You can set them up to perform quite well and also have reasonable economy.

[TRD ke70]

Hey Mitch, would help if we knew what restrictions the class makes on the engine.

 

Myself, stay the f@$k away from a holley carby, if you want bang for buck, dellortto's are the way to go, with a set of K&N filters, stay away from foam filters, they have there place, but they let water through!!! water = BANG!!!

Standard valves are good, they just need a little work on the back of the head of the valve and they'll flow well.

Spend as my time on the ports as possible, educate yourself about porting, bigger is not always best.

Big ports don't create airspeed, it's the shape of the port that is important!!!Get a book called practical gas flow by John Dalton, it's a great little book for the beginner and it's easy to understand.

 

Don't waste your money on conrods unless you are going to rev it to 10,000.

there are 2 types of 4k rods, one is an early lite rod, it's good to 8'000, the other is a later rod, it's heavier but is good to 10'000, these are found in most 4 and 5k engines. clean them up and balance them.

 

Pistons, are up to you, forged are the best but expensive.

 

With valve springs, get a good set of singles, as doubles robs to much power from such a small engine.

Singles are good to about 8'500.

Oh buy yourself a rev limiter as well, f@$ken good insurance!!

Electronic ignition also adds power, the standard denso setup is good.

get a decent set of extractors, most out there aren't worth shit, pipe size is where it counts.

But don't open up the exhaust ports in the head, just clean them up.

get yourself a lightened flywheel, this makes the engine accelerate faster.

Double row timing chain is a must, and balance everything that rotates.

Twin electrode plugs are worth a couple of HP as well, but don't buy bosch ones, there shit, NGK or DENSO they are good.

 

Last thing, what are you running the car in? rally, race??

[philbey]

Don't waste your money on conrods unless you are going to rev it to 10,000.

 

my sentiments exactly, I'd only spend the 600 bucks (half of the cost of a good complete engine rebuild) on rods if I were going for 150hp race motor.

[Mitch-12]

Hey Mitch, would help if we knew what restrictions the class makes on the engine.

 

Myself, stay the f@$k away from a holley carby, if you want bang for buck, dellortto's are the way to go, with a set of K&N filters, stay away from foam filters, they have there place, but they let water through!!! water = BANG!!!

Standard valves are good, they just need a little work on the back of the head of the valve and they'll flow well.

Spend as my time on the ports as possible, educate yourself about porting, bigger is not always best.

Big ports don't create airspeed, it's the shape of the port that is important!!!Get a book called practical gas flow by John Dalton, it's a great little book for the beginner and it's easy to understand.

 

Don't waste your money on conrods unless you are going to rev it to 10,000.

there are 2 types of 4k rods, one is an early lite rod, it's good to 8'000, the other is a later rod, it's heavier but is good to 10'000, these are found in most 4 and 5k engines. clean them up and balance them.

 

Pistons, are up to you, forged are the best but expensive.

 

With valve springs, get a good set of singles, as doubles robs to much power from such a small engine.

Singles are good to about 8'500.

Oh buy yourself a rev limiter as well, f@$ken good insurance!!

Electronic ignition also adds power, the standard denso setup is good.

get a decent set of extractors, most out there aren't worth shit, pipe size is where it counts.

But don't open up the exhaust ports in the head, just clean them up.

get yourself a lightened flywheel, this makes the engine accelerate faster.

Double row timing chain is a must, and balance everything that rotates.

Twin electrode plugs are worth a couple of HP as well, but don't buy bosch ones, there shit, NGK or DENSO they are good.

 

Last thing, what are you running the car in? rally, race??

thanks mate i got a msd 6al rev limiter my dads an engine builder he can help me with the proting I'm gettn the flywheel lightened the class rules are 1300cc no more and no avgas or methanol thats it everything else is free for all i only wanna spend 1500ish and i was thinking holley cause i have so much holley shit or i can get a 28/32 webber if thats anygood??

[Evan G]

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.

 

aye felix can you pm me some names please of suppliers of timing chain kits (spokets,chain,tensioner)

 

thanks mate

[Felix]

aye felix can you pm me some names please of suppliers of timing chain kits (spokets,chain,tensioner)

 

thanks mate

 

Karmot is one supplier. I'm out of the loop, has been 6 years or so since I worked as a parts interpreter. Check around your local spare parts joints to see what they can get.

 

Here's some part No's anyway to get you started:

 

 

Another one: Rollmaster CS9000... Think it is adjustable with multi-keyways.

Edited April 21, 2010 by Felix

[Evan G]

Karmot is one supplier. I'm out of the loop, has been 6 years or so since I worked as a parts interpreter. Check around your local spare parts joints to see what they can get.

 

Here's some part No's anyway to get you started:

 

 

Another one: Rollmaster CS9000... Think it is adjustable with multi-keyways.

 

 

thanks felix!

 

acl doesnt make them

rollmaster cs9000 min order 50? :dance:

 

ive found a set on ebay in the US for $40

 

ill head down bursons and see what they can dig up

[Taz_Rx]

Yeah I've got a rollmaster kit which I haven't installed yet (will get put in a new motor) and yes they're adjustable with keyway holes nearly the whole way round.

Edited April 21, 2010 by Taz_Rx

[Mitch-12]

lol wtf was i thinking in this thread haha well now i did this :) http://www.rollaclub.com/board/topic/52058-supercharged-4k-motec-injection/