are 4k exhausts and intake manifolds and 3k exhaust and intake manifolds interchangeable?? i know its a stupid question but just want it clarifyed.

 

 

having said that is there a better or worse intake or exhaust manifold that i can put on my 3k?? is a 4k, 5k inlet bigger or longer?

some 3k's wont have the oulets nor "plumbing" for the EGR. so they WILL bolt up. just depends what engine each manifold is from.

 

I know of 3 different exhaust manifolds, there may be more?

 

1 i had on my ke25. single outlet, 2 bolt flange ( not the best option in my opinion)

 

the 1 i have on my ke30 2 small outlets. Bolts to a twin pipe that merges into 1. kinda like 4-2-1 style extractors.

 

And the one i have off the 2 ke70 4k's i have had. single outlet. bigger that the one i had on my ke25.

 

I myself would run with the 3-2-1 manifolds.

yeah agree as above...

 

ive just done this myself, tried to find the best bits out of a complete 3k and 4k engine/manifolds/carby to run the 4k in a ke20.

 

ended up (out of neccessity) going with the 4K motor, 3K 4 into 1 headers (purely to bolt up to exhaust that was already on car), 3k bigger port intake manifold (even though the ports on the motor are smaller...) with a 4k carby on top.

 

had to use the ke20 3k intake because the 3 bolt triangular mount that joins the exhaust and intake manifolds point opposite ways to the 4k and ke3x 3k bits! these intake manifolds don't sit right on the ke20 3k exhaust manifold so doesnt bolt up to the engine right. also the 3k intake not having the EGR port worked out well as the ke20 doesnt have a brake booster to connect that hose to.

 

also had to switch the accelerator mechanisms on the carby because the ke20 has a different accelerator cable that clips on instead of sliding in the slot.

 

does that make any sense?

 

it ended up working just fine, no leaks.

 

hope that helps!

Edited January 12, 200917 yr by son of stig

just thinking though, what car is this in?? cause if its a ke30 or higher id say definately use the 4-2-1 headers. in which case a ke30 3k or 4k intake will bolt up to it (as opposed to a ke20 3k where the bits seem to need to be ke20 specific). and the ke20 3k intake seemed to be a bit longer as well as having bigger ports.

I have used the later KE30 stuff in a KE20. Just need to make sure that the manifolds are a matching pair. Or take to the inlet with a grinder to cut off the triangle and make a plate up to cover the hole in the exhaust. Then it wont matter what combination you use.

 

This is what I did when I ran a 3kB manifold with extractors.

some 3k's wont have the oulets nor "plumbing" for the EGR. so they WILL bolt up. just depends what engine each manifold is from.

 

 

also the 3k intake not having the EGR port worked out well as the ke20 doesnt have a brake booster to connect that hose to.

 

Did the K-motor even have EGR in Aus? Can't remember ever seeing it on my KE55. Note that a lot of people get EGR confused with the heat-stove for the intake manifold (the "triangle"), EGR actually puts exhaust gases back into the intake whereas the heat-stove just uses the gas to heat the manifold, thus allowing for better atomisation etc (ie emissions, ie less power :y:)

oh perhaps its not called an egr valve then. my bad. definately not the triangle intake heater bit tho. my 3x and 5x have a hose and valve coming from the rear side of the INTAKE manifold linked to the brake booster. i assume it only came on models which have a brake booster, so the ke20 doesnt have the port for this hose as it didnt have a booster?

oh perhaps its not called an egr valve then. my bad. definately not the triangle intake heater bit tho. my 3x and 5x have a hose and valve coming from the rear side of the INTAKE manifold linked to the brake booster. i assume it only came on models which have a brake booster, so the ke20 doesnt have the port for this hose as it didnt have a booster?

 

Not sure bout KE20s, but pretty sure KE10s didn't have a vacuum booster for the brakes.....then again, the car was so light that you don't really need them (and you've got drums all-round)

Did the K-motor even have EGR in Aus? Can't remember ever seeing it on my KE55. Note that a lot of people get EGR confused with the heat-stove for the intake manifold (the "triangle"), EGR actually puts exhaust gases back into the intake whereas the heat-stove just uses the gas to heat the manifold, thus allowing for better atomisation etc (ie emissions, ie less power :y:)

 

Not sure about the ke55's but the ke70 had it for sure. EGR stands for Exhaust Gas Recirculation and uses already burnt gasses to apparantly improve ecconomy, not that K engines needed it.

 

Oh and both KE1x and ke2x didnt have brake boosters. Ke3x onwards did. Manifolds are easy to drill and tap to accomodate a vacuum port for a booster line

 

EGR "plumbing" outlined in red. The "hotbox" or "stove top circled in green :P

 

Edited January 13, 200917 yr by SLO-030

definately no sign of one of those hideous little puippies on any of the manifolds ive got!

THe set currently on my ke30 have the hotbox but no EGR. I wonder how the EGR diaphram would handle boost :|

cheers for the info fellas, from what I'm thinking is buiding up a 4k and running my 3k manifolds, losing the egr gear on it. Is there anypoint in grinding this heat triangle to try separate the 2 manifolds and cool down the air in the inlet?

Hotbox is just there to warm up the intake so the fuel vaporises easier when the engines cold.