Worked 4age????

[tristybomb]

Hay fellas after my 86 is nearing completion ive decided to start building a decent n/a ge, my current engine is a rock stock bigport with 4-2-1 extractors to 2 1/4 system and a set of fcr carbs http://www.ae86drivingclub.com.au/forums/emoticons/smile.gif

Im just trying to get an idea of what parts to look out for if they come up cheeply.......... the plan is to build a decent ge that will make around the 170 to 200hp at fly BUT it canot have to higher comp ratio to achieve this as i plan to run direct port nitrous.....

i plan to run a near std bigport head but with the biggest cams i can runs with std shims ect i think there around the 180 degree mark and 8mm lift not sure thoe the head will have extensive port and polish work.....

these are basicly the things that i need to know

1. what block should a start with 7 rib or silvertop 20v

2. will any 4age rods, crank, or even pistons be able to cope with the power im after and be able to withstand a shot of nitrous with exstensive ballancing pen shotting crack teasting ect ect all done to ensure there good before i put them in my engine........ im fairly positive ill have to run forged pistons can anyone recomend some places that will be able to supply a custom set of pistons and rings under 1k...

3.what kinda comp ratio should i run...... or should i run oversized pistons so i can lower the comp e.g 11.5:1 equal to 11:1 40thou oversized items?????

4.does anyone have any good ideas on how to actually deliver the nitrous as the fcr carbs sit so close to the block it makes it near impossible to deliver it that way only thing i could come up with is to basicly run a nitrous(fuel) rail and deliver the nitrous by basicly spraying it into the carbs....... not sure if this will affect them thoe.....

any help would be great guys thanx!!!!!

Cheers

[rthy]

1: the 20v block is a 7 rib

2: ae92 or 20v silver rods are great when modded properly, its revs that kills rods not load unless your talking massive pressure.

With the nitrous I am guessing its a wet system, why not have a constant high compression ratio and run a secondary fuel system that is for the fuel/nitrous fogger only, that way it can be race fuel to compensate for the extra compression resistance thats needed.

3: 11:1 is a good static compression ratio for na aplications on 98RON fuel, check out Arias's all motor pistons.

4: FCR carbs?? please explain???

[slide86]

dont spray NO2 into the carbs, you will have to make a fogger for each cylinder and put it after the carbs. you say you want to run direct port NO2, well, use the original fuel injector ports on the head.

how are you going to control the extra fuel that you will need for the NO2 system?

use a 20v bottom end with a big or smallport head.

i would be getting stiffer valve springs and set the head up properly if you intend to make a tuff atmo engine, these things need revs to make power. valve springs and retainers should be on your list. the standard bigport cams are 25* degrees or something.
how can 180 be the most you can run with standard shims?

[chapl]

i plan to run a near std bigport head but with the biggest cams i can runs with std shims ect i think there around the 180 degree mark and 8mm lift not sure thoe the head will have extensive port and polish work.....[/b]

???

[ae86hachiroku]

sorry slightly off topic but is NO2 not allowed on cams tracks?

[slide86]

^^^i believe that is true. (i think)

[Bustin_86]

FCR carbs. He means Quad Carbs.

I think you should get your ge running, drive it and do research man. Make your own decisions.

[tristybomb]

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i plan to run a near std bigport head but with the biggest cams i can runs with std shims ect i think there around the 180 degree mark and 8mm lift not sure thoe the head will have extensive port and polish work.....[/b]

???
[/b]

sorry around 280****

FCR carbs are quad carbs used in japan mostly very responsive and expensive.... lol have a read
http://www.club4ag.com/faq%20and%20tech_pa...the%204A-GE.htm (http://www.club4ag.com/faq%20and%20tech_pages/Carburators%20for%20the%204A-GE.htm)


yeah justin i will get it running im just finding out what parts i need so if they come up cheeply ill grab them save myself a few dollors that way.......

hummmmm what if i un hooked the bottle when i went to cams approved tracks???? probly do what sam q sed make up another fuel system for it ill prob end up using a heap of magnafuel products for the fuel system they arnt cheep but cant go wrong and if they dont have it no body will...

[floody31]

FCR carbs. He means Quad Carbs.[/b]

Eh, sure he doesn't mean four Keihin FCR flatslide carbs http://www.ae86drivingclub.com.au/forums/emoticons/tongue.gif


As for the nitrous, direct port means direct to the port, so yeah, in front of the butterfly, use original injector bosses or weld bosses to the adaptors.

As for the 170-200hp and your compression ratio, decide whether you want 170hp NA and 200hp on gas or 200hp NA. Tentatively I'd say you aren't aiming for an agressive enough cam profile to get anywhere near 200hp in any case from the sound of what you want to do with the valve springs, retainers, shims.
I'd say a 170hp motor with the occasional shot 30-40hp shot would probably be no worse for longevity than an unassisted 200hp motor.


But in the end all I can say is wow mate, you must sweat dollars, first the 1JZ AE86 project car now a 200hp 4A-GE, good luck with it all.

[Bustin_86]

Sorry Floody, i didnt know the exact specs, just trying to help Sam Q with my limited knowledge, thanks for pointing out the proper name of the carbs http://www.ae86drivingclub.com.au/forums/emoticons/smile.gif What does the Keihin mean?

Heath, your spending so much on this engine and car man, just get the bigger cams, and get some of that head work done that you are trying to avoid.

[floody31]

Sorry Floody, i didnt know the exact specs, just trying to help Sam Q with my limited knowledge, thanks for pointing out the proper name of the carbs http://www.ae86drivingclub.com.au/forums/emoticons/smile.gif What does the Keihin mean?[/b]

No worries. Keihin is a carburettor (and I think EFI parts) manufacturer, FCRs are their topend model of flatslide carburettors. I haven't run them on a car but have seen firsthand power gains with their carbs on MX and roadrace bikes.

Keihin FCR
http://www.showandgo.com.au/carbie/carb1_bf.html

Mikuni also make carbs which I would imagine are POSSIBLY suitable, the RS Smoothbore flatslide and TM 40 flatslide being the two which spring to mind (but they don't seem to do multicylinder TM sets any more).
http://www.showandgo.com.au/mikuni/mikuni_bf.htm

However the FCR is the carb of choice.

[rthy]

slide86 has a valid point, how would you enrich the mixure for the N2O?