Building Extremely Tuff 5k Bottem End

[KE55PIG]

Hey

I don't no if anyone is going to give to much info away but I'm looking for a couple thing one being

The max a 5k can be bored out to ?

What pistons can be used to suit this bore size yet keep compression (was looking at 4age but they have dished pistons)

Also keeping same pin size so can connect up to 5k rods

 

Its all just and idea at the moment but if i get some spare cash i wouldnt mind going for the Highest HP/kw N/A K engine

[philbey]

if you get some spare cash. Funny as. When I get spare cash it's 50 bucks, not 2000 bucks...

 

I reckon Androo from sydney was selling a worked 5k using 4AGE pistons and rods or something to that effect.

[kangaroosa]

I had pistons from a Gemini in mine. The top of the piston had to be machined off and slight valve reliefs cut in. About 81mm Diam pistons from memory. But you could go bigger as mine was a safe rebuild.

 

I broke a few dual valve springs before anything else had a chance to break.

[philbey]

You sure about that piston size darren? You can get 60 thou over for a 5K which is ~82mm? Just sounds like a lot of work when ACL supply them to drop straight in.

[TRD ke70]

Yip 4AGE pistons and rods can be fitted, but the block as to be machined down about 1.5mm to get good compression, the A rods aren't as wide on the bigend as the K rods but this doesn't seem to cause any problems.

 

Know of a couple of race and rally :yes: engines which are done this way and have had good reliabilty out of them.

[KE55PIG]

Philpey- well id be happy with 82mm will have to find out what a set of them are worth

 

TRD-so the a rods do fit the crank ? That you know of.

 

if thats true it would only cost max 1.5k to do it and would be feasable to it bit buy bit.

 

As it is my dream is is to have a 100 rwkw engine in a corolla weather ill get close to that or not i don't mind i just want a mad sounding free revving engine.

[kangaroosa]

You sure about that piston size darren? You can get 60 thou over for a 5K which is ~82mm? Just sounds like a lot of work when ACL supply them to drop straight in.

I actually had a gut feeling they were 83mm pistons, but i couldnt find the specs sheet to back it up. The engine was just under 1600cc if someone wishes to do the maths.

[anastasios]

ive got 4age pistons in my 5k, and yes apparently so does andrew, his my cousin, the engine i bought was ke25 racers one and should be up and running pretty soon,

[TRD ke70]

yeah the 4k-5k crank has a 42mm bigend, so does a 100kw 4age, i think thats right, pay to check.

 

because 4Age's also had 40mm bigends!!!

but yes cheap way to go, but there can be some problems along the way.

 

Need anymore info, PM Tony(TRD) and he should beable to give you all the info you need.

[tojo2]

and then there`s the expensive way.. http://www.esapeltonen.fi/

[anastasios]

lol i can't read norweigian

[philbey]

Philpey- well id be happy with 82mm will have to find out what a set of them are worth

 

I bought 40 thou over which is 81.5 and they were about 160 bucks through my engine builder. 60 thou over should really be the same price.

 

I actually had a gut feeling they were 83mm pistons, but i couldnt find the specs sheet to back it up. The engine was just under 1600cc if someone wishes to do the maths.

 

Sounds about right, mine was 1550cc with 81.5. Close enough.

 

yeah the 4k-5k crank has a 42mm bigend, so does a 100kw 4age, i think thats right, pay to check.

 

because 4Age's also had 40mm bigends!!!

but yes cheap way to go, but there can be some problems along the way.

 

I'd look into running the 40mm big end rods and get your crank offset ground to stroke it, you could push the motor over 1600cc that way. All getting pretty expensive though.....

[camerondownunder88]

If yuour building a tough K motor bottom end first thing you will do is ditch the 18mm gudgeon pin size stock rods have and go 20mm.

 

4age rods will give you 20mm. If you use 100KW 4age stuff you will need to deck 5mm off the bock there abouts. this will keep your compression but can't go back to using K stuff really block will be to short.

 

Also all the TRD K motors ran calito (spelling I think is a bit off) rods. When I last looked price for a set to sit a 4K was $900 AU. 20mm pin and well were good to over 12,000RPM and a very nice item.

 

Also If motor is N/A a good set of ACL/general brand pistons on the right set of stock rods polished shot peened adn all the works doen to them will be strong. Talked to a guy once who race a 3K he built had everythign roller rockers etc the lot said he worked out a K motor stock rod is good for about 140WK motor build before they can start to fail.

 

And just putting it out there there are 3 yes 3 types of conrods for K motors int eh 5K range. On eis better than all the others. don't have the photos on me but soon as you see all 3 next to each other you will notice quick the better one to use.

 

Also a 1.99mm shim in the oil pump will give about 80PSI oil pressure at the inlet to the oil filter with cold 20W-60 oil. And when building a 5K block up careful witht eh cam shaft a noram 4K/3K/2K/k etc cam shaft is slightly different and can puntch the rear welsch plug out the block piss oil down the fire wall and ruin your day seen it happen. So messure messure messure parts don't assume there the same as some 5K are a bit off.

 

Cheers

Cameron

 

P.S. What cyclinder head you running?

[KE55PIG]

hey thanks heaps for that info.

was thinking either a 4k head or maybe a 5k head that ill eventually do larger valves 32mm intake port to suit my 3k-b manifold

 

Will be used with a 286 deg cam

Edited October 27, 2009 by KE55PIG

[KE55PIG]

ok before i thought about the whole decking the block thing

i was looking at with a 83.5mm piston and a 75 mm stroke i could get a 1.64 l engine but cing at we would be decking the block would be going down in cc anyway. bugger

so anyone got ideas on going on stroking the 5k

i strarting to think its all to hard and that id be better to just got the 60 thou acls and then see what i can do with that i guess witch will give me a 1.58L wich would be good

Edited October 27, 2009 by KE55PIG