POWER NOT THE ANSWER

[gatemaster]

Just for the heck of it, consider this option if it can save money and hassle. Turbocharge the 3ac or 4ac with a reasonable boost. To prevent blown head gaskets have a grove machined in the cylinder head around each cylinder and put a copper wire ring in there. Use a weber or adapt an EFI to the system.

[Typrus]

I almost wonder if one could not get the TBI setup off of an older 1.6 or 1.7L motor and adapt it to fit. There has been an example of a 1.3L Geo TBI setup being adapted, but if for performance, I'd imagne something from a larger displacement motor would better suit the purposes.
Why TBI off of a donor car? They are very simple. With Speed-Density type metering, there is no MAF restriction or setup. Pretty much everything extra that the system needs is contained in the throttle body and computer. The same temperature senders could likely be used, provided resistance was similar. No crank or cam sensors to wire up, and if tach signal is required, that extra plug on our distributors that is capped off is a direct route to coil negative (at least on the 84 distro I disassembled) and is tach signal.

Just put a carb hat over it, get a 1:1 pressure increase pressure regulator, and a turbo off of a Nissan 300Z Twin Turbo. We've seen the example of that posted on here. Boost comes up relatively quick, and low teens boost would likely not overtax the turbo.

Fire-rings would help to an extent, but if you can't maintain uniform high clamping across the head surface, you'll end up with a low-pressure spot that is just dying to fail. Albeit, a copper gasket with fire-rings and some ARP studs would likely work great. I'm just not sure on the availability of the studs. Is there room in our blocks to accept 1-2mm larger diameter bolts/studs? That would help bring clamping loads up.

If you could find one you could steal a 4AGZE supercharger. A 4AFZE would be pretty stinking awesome.

[Petros]

I have tried copper gaskets with 11.2:1 CR (which not that high) and still had leakage. I am not sure the copper o-ring on the head would help (I am familiar with it, I have installed them on racing engines with 13.5:1 cr), the problem with the 3ac/4ac head is the poor water jacket design, it does not cool around the exhaust valves very well,. The large temp gradient between cyl. 1 and 2 and between 3 and 4 distorts the head there, and causes leaking. By putting a turbo or supercharger there you are rasing the combustion pressures and temp, just like my raising the CR, you will have the same problem. Forcing more power through the engine, no matter how it is done, will drive up the heat in the exhaust and you will have the same problem. There is no magic formula, more power means more heat distortion in the stock head, it has to go if you do not want the problem.

The more power out of the engine, the more fuel/air mixture, and the more heat in the exhaust. So I predict you will have the same problem as I did with leaking gaskets between cyl. 1 and 2, and possibly between 3 and 4 (rear cyl. are not as hot as the front ones because of direction of coolant flow through the head from rear to front).

It is far easier just to replace the head (or the whole engine) with one that can produce more power reliably. So why waste time and money dorking around with a turbo? You will likely have more money into it than just doing an engine swap, and have all kinds of troubleshooting and other problems to iron out, and still have that obsolete head to fight with. And then will just give it up and do the engine swap anyway. So I am heading straight to the ultimate solution and going the best engine that will fit, the 4age.

[toughtercel]

ok , wanna hear something funny , my wife current 85 tercel built for canadian but have some Cailf stuff but NO CATALYST and my former 86 TERCEL 4WD which i still have in my back yard are made for canada also dont have CATALYST , then last month bought car from WASHINGTON , driving it now , this car are fully loaded with CATALYST/OXYGEN SENSER and many unknow emission equipment , all car are tested compreesion test (150-160psi) both tercel made for Canada are way faster up hill than made for US built , NOW WE HAVE POWER .

[Typrus]

I'm still voting that trying to reverse the coolant flow through the engine will be worth a shot... Somehow disable the impeller in the water pump and use an electric pump to go reverse. GM does it in their LT-series small blocks and I believe the LS-series also does it. And those are some solid engines. Its worth a shot. As long as its all still thermostatically controlled, there will be no "super-cooling" of the head. Though, I also happen to think it would be beneficial to make it pump cooler coolant in from the front and back of the head. Not sure how to make the heat work at that point.

[gatemaster]

I think you are beating a dead horse with regards to the 3ac, 4ac, jmo.
Does the canadian models have better trans?

[toughtercel]

something else interesting , both Tercel Canadian FED / US FED have 2 barrels carbuator ,here what i discover.

Canadian tercel - when i'm driving ,up hill or passing fast , it can open second barrel , and i clock this car 85 mph easliy.

US FED tercel - i put the gas padel all the way down to the floor but it only travel half way distance before the floor , it seem blocking and second barrel does'nt open "WHAT" , then told my brother about US fed tercel and he think maybe it because AMERICIAN's law in the 80's was strictly 55 mph zone , ooohhh so what do you think guys , i better do some experimental to see if i can change the gas pandel or what ever

now you asking if Canadian transmission are stronger , i have no idea , how can i tell ,by vin number , take apart (hope not)

[hberdan]

something else interesting , both Tercel Canadian FED / US FED have 2 barrels carbuator ,here what i discover.

Canadian tercel - when i'm driving ,up hill or passing fast , it can open second barrel , and i clock this car 85 mph easliy.

US FED tercel - i put the gas padel all the way down to the floor but it only travel half way distance before the floor , it seem blocking and second barrel does'nt open "WHAT" , then told my brother about US fed tercel and he think maybe it because AMERICIAN's law in the 80's was strictly 55 mph zone , ooohhh so what do you think guys , i better do some experimental to see if i can change the gas pandel or what ever

now you asking if Canadian transmission are stronger , i have no idea , how can i tell ,by vin number , take apart (hope not)

Merci pour les informations. J'espère que mon français n'est pas trop mauvais.

Je crois que carburator américain a été conçu pour limiter des émissions comme il est exigé dans la plupart des états américains, même au cours des années 1980's. Cela a fait les mauvais changements à l'accélération et au pouvoir de locomotive.

[hberdan]

double posted ,sorry

[gatemaster]

I noticed the same thing with the oem carb. No matter what the secondary wouldn't open. Now that I have a weber that has changed. when I step on it the weber opens and power comes on.

[toughtercel]

Merci pour les informations. J'espère que mon français n'est pas trop mauvais.

Je crois que carburator américain a été conçu pour limiter des émissions comme il est exigé dans la plupart des états américains, même au cours des années 1980's. Cela a fait les mauvais changements à l'accélération et au pouvoir de locomotive.
Last edited by hberdan on Fri Mar 20, 2009 5:23 pm, edited 1 time in total.
hberdan
Top Notch Member

hi , is "HE or SHE" trying to be funny, or does'nt believe what i said .

[ARCHINSTL]

It could be that he thinks English is not your first language from your postings...although I do not read French.
Tom M.

[toughtercel]

HA ! well my first and half language are sign language (ASL)

[hberdan]

Sorry I actually DID think you were French Canadian; your writing style reminds me of all the French/English slang in and around the French speaking provinces, I thought I'd try some French and see. We do have some French speakers here.
All I actually said was that I agree with you, that American carb was set up for emissions control, not for speed or acceleration.

[toughtercel]

thank "hberdan" when my wife or I meet people and talk with our voice , 80 % of people think we came from another country , well the real answer is that we are DEAF , my wife little better than I am in GRAMMER , my kids are better than us (HEARING) so i am on my own typing , best friend(dictionary)and try my best and i read my own language few times before i send it , still not proper language . about the car made for americian , now i know why evryone seeking power because of emission system , can you guys change it to like Canadian built , because some of the STATE dont require emission inspection , for example like in B.C. only Vancouver lower mainland require AIR CARE and whole B.C. don,t require except NAIAMO and VICTORIA i don't know , thanks