4AGE Head and Block Decking

[jeffro ra28]

Sometimes sleeving makes the block weaker as you are removing alot of the parent metal So be careful.

Just because it doesnt have a turbo doesnt mean your rods are not going to be the weakest link. Conrods are under the most stress on their exhaust stroke for that cylinder, and the more revs the more stress. EDIT: What im trying to say is that revs determines your conrods threshold not a turbo.
Personally, i would not have an issue with using the SPOOL rods at very high revs tho.

Maybe iv missed it, but what fuel are you going to be using with all this compression?

[allencr]

i never thought of sleeving it brilliant idea.

You can cut the head & block until the the piston smashes the head.
Sleeves are not brilliant and there is so much that you have never thought of & probably never know.

[abently]

I'm not a big fan of 'pop top' pistons, they don't leave a nice combustion chamber shape. From a theoretical point of view, milling the head could be a better way to go than high compression pistons, it gives you more quench area and a cleaner chamber.

Me too, but the efficiency gains outweigh the risk of pinging when using such large cams.

ENDYNs own trial and error efforts has proven this.

[KARNAGE]

i have seen a 4a block with a set of dart sleeves install it was a 81.5mm bore and in between each cylinder there was actually no block left and the sleeves are touching each other. i didnt like the idea but the machinest said it works fine

[Cuzzo]

ahh i never thought of sleeving it brilliant idea. Is that an expensive process these days?

Cheers
Jak

Hahahahahahaha

What and trying to build a 300hp NA isnt? LOL

Seriously why are you wasting your money on a NA motor? Let me guess your on your P's with turbo restrictions?

[takai]

Hahahahahahaha

What and trying to build a 300hp NA isnt? LOL

Seriously why are you wasting your money on a NA motor? Let me guess your on your P's with turbo restrictions?

Thats not the same thing, i build NA engines because of class regs.

Fwiw, decking and deshrouding, if done properly, dont cause hotspots and detonation. Keep pulling it guys....

[abently]

Actually come to think of it, you should be one of the people with most relevant decking experience here ?

Care to suggest how thin a deck is doable before you start seeing warping ?

[takai]

I wouldnt go much past 60thou, and my next build is only going to be around 20-30thou, but thats valve size limited.

[jak]

Main reason for doing this is to see how much power can be made from an NA 4age because im not the biggest fan of turbochrged ones. I like the engine and want to see how far i can push it.

If 81.5mm is the sleeving limit of the 4a theni will probably just bore it out to 82mm and see how it goes.

Seems like high comp pistons, bored and stroked then just take it to my machinist and get him to shave it to the max possible.

You wont get anywhere unless your willing to blow up an engine in search of the limits. Just trying to get a general idea of what people have take it to.

Cheers
Jak

[jeffro ra28]

Take it beyond the relms of formula atlantic TRD engines with huge budgets?

[Cuzzo]

My smallport is 83mm

[allencr]

and stroked

Any particular plans you'd like to share with us about how you are going to go aboutstroking this beast?

[oldeskewltoy]

If you do your research... there are slightly different pistons out there, that combined with head/block decking should get you upto/over 12 to 1.

Personally I'd avoid the Wiseco/JE Piston versions in favor of the HKS, or Toda slugs. It seems the HKS and Toda slugs don't go to a peak on the top of the pistons like the Wiseco does. I believe Tomei fits the HKS/Toda type

If you are VERY careful with your de-shroud and chamber polish, you can do the chamber work and only gain 2 cc.

Atlantic engines were LIMITED.... I can't speak for other F/A builders, but I know Loynings can exceed 240hp from their 4AGs


Concerning stroking it... You just missed an HKS 5AG kit... complete!



http://page4.auctions.yahoo.co.jp/jp/auction/d95819311

just 190000 yen($2000 US)

[KARNAGE]

is that the kit that you have to shave a bit of meat off the inside of the block near the crank? thats not a bad price when you think bout it, what capacity does the make the engine then?

[jak]

i was thinking a gas motorsport style stroker kit where they linish one side of the big end journals and then modify the bearings to suit. works a treat they do it on some of there 1000+hp 2j's.

You can cut the head & block until the the piston smashes the head.
Sleeves are not brilliant and there is so much that you have never thought of & probably never know.

seriously man unless u have sumthing useful to say go away. i know its a big challenge but hey im gonna giv it a go and if u dont want to help just dont. No one should get neg repped for taking on a challenge.

Cheers
Jak