live4soccer7

I think I'm going to give lc engineering a call tomorrow and see what they have to say about this build. I'm not dumping any more than a couple hundred more into the engine, but I think with tat much I can get it running in tip top shape and maximize it's performance w/o any additional major changes. I'll post up here tomorrow sometime and let you all know what I find out on this. Seems like there isn't much documents info on these things out there and I haven't been working with engines long enough to know enough about them to make all the appropriate choices/adjustments.

abeD85flatbed

Denso plugs, you can open the gap up to .034 and not have any problems with missfire and still get a little more spark exposure. I have run my hybrid this way for years. Another option as far as building the engine is shaving the head down. You would have to use flat top pistons but can then have the larger 22R valves installed in the 20R head. Depending on the cam choice this can bump compression over 10:1.

live4soccer7

Thanks for the info. I'm gonna get some new plugs and check the gap as well.

I talked with LC engineering today and they weren't quite as helpful as I would have liked, so I didn't really get any useful information there.

Anyone have experience with the adjustable cam gear?

'86Owner

Ok, so you can bolt a 20r head on a early 22r block, but can you make it fit on a late block?

live4soccer7

I believe you can, but I think there is some machining that has to be done.

'86Owner

Ok, that's what I was thinking. How much and what kind of machining?

Yopar

iTrader: (2)

AFAIK, problem areas are: the deck height is lower on the late model blocks so what pistons are you supposed to use, and what length timing chain do you use. The head will bolt on to the block, but these items need to be addressed for it to work. The early pistons pop up into the 20R head, the late pistons don't do that, so you will lose compression if you use the late pistons under a 20R head.

'86Owner

^I see. Would domed pistons do it or would you have to use a taller piston or longer rod or...?

'86Owner

Another thing, what exactly is the difference between the early and late blocks anyway. What is the difference in compression ratio, stroke, bore, ect. if any at all.

'86Owner

^ Isn't it that the late block has a taller block and shorter head? If that's the case wouldn't you be able to put a early 22r head on a late 22r block and get the same results, or near it, as the 20r/22r hybrid?

xxxtreme22r

NO it will not work don't even try. One guy on here swore he had a machinist to do it, guess what he never came back to say what his progress is, I think he took the walk of shame because he kept arguing with me saying his machinist can do it, simple answer is no it will not work, don't even try it's not even worth the trouble, too many things can go wrong.

live4soccer7

^ I stand corrected. Perhaps I may have been reading that thread. I won't sit and argue it. lol.

'86Owner

^In that case an early head probably wouldn't fit a late block either.

xxxtreme22r

Correct. The only thing that has proven to work in the many years people have been modding the 20r and 22r engines is the 20r head on an early block. But as stated before, porting the 20r head and using bigger valves is necessary to make the hybrid engine worth doing.

'86Owner

Hmmmm....

yeehaw1

geez, this is an old thread lol, i've contemplated this set up, but i don't know if i could make as much hp and torque as cheaply as i could with a 88' 22re.
i've got both a unknown year 20r and an 84' 22r, but i have not read enough to know the kind of power it would make.

live4soccer7

I'll tell ya, answer these questions first.

Is your 22re in good condition? What mods do you have to the engine? What condition are your donor 20/22r engines?

yeehaw1

22re needs rebuilt, i'm still weighing options lol, the 20r will start and run, and if the 22r had a fuseblock (does anyone have a wiring diagram for that btw) i belive it would run, i can turn it over by hand.

live4soccer7

That's a tough choice if you are pretty much going to rebuild both. I think if my truck was wired for 22re and I had the engine I would do that and put a cam in it while you are at it and any other head work and you'd probably be better off than with the 22r/20r.

In my opinion for the 20r/22r to be worth it you need a port/polish, stage 2 or above cam (then requires better valve train), forged pistons that are notched so you can use your cam without valve/piston interference, and you'll need/want the double row TC setup and an adjustable gear, not to mention a performance carb setup (webers single or dual setup). Over at toyosport they use to build these motors and they say that they can put out around 180hp if built correctly. I've bought my 20/22r for $700 and it was rebuilt maybe 10k ago before I bought it and it is more powerful, but not build with all the good stuff that it needs to take advantage of its ability (I'm not willing to dump the $$ and time into it to get to toyosports specs b/c I don't think it is worth it). I'm leaving it as is until I put a larger motor in the truck. Probably a small block of some sort.

Just go with the 22re and keep your fuel mileage and reliability.

yeehaw1

Thanks for the info, that's the most clear ansewer i've read about the hybrid. After reading that, i think i'll use the 22re, was leaning more toward it anyway.

My current plan is to rebuild the 22re, with a cam, match the exhaust ports on the factory manifold, expand the diameter of the exhaust, no cat, battery/airbox swap, dual batterys, cold air-box, e-fan, no a/c, bigger valves in the head, and whatever else i can lol.
I'd like to get 150 hp, and 200 ft/lb of torque