Whats the Deal with Oversize connecting rod bearings, are they better? any advantages to regular size bearings?
Are there any 80 over Forged slantsix pistions availible? if so who makes them? also what are the MAX size valves that can go in a slantsix head, and what make are they??? i want the most flow i can get for my motor, more on it later....

Thanks
Justin

I had .010" over size mains and connecting rod bearings in my 400. Didn't notice anything, it was only done to clean up the journals. As for the heads, Reed has a head with Ford 300 six cyl. valves, and another friend just had some head work done, including the valve seats being cut for new stainless Ford 300 valves. I don't know the stem diamiter, but both had bronze guides installed, more than likely reamed to fit the Ford pieces. 340 springs are on Reeds head, not sure what my other friend is using on his.

Thanks Eric

i was told that having an OS bearing makes things more durable in an engine and creat less friction...

Anyways still need to know about the Forged pistions (i've been looking around but have come up with nothing so far)

And as for the POLL up at the top, i've been leaning towards the TwinTurbo with Nitrous engine but so far it looks like the 198/2.2L combo is a favorite

Justin

Actually I'd like to see all of them in person. There are only a few slants around Calgary with some extra work done to them. Barry Z with his Barracuda and mine.
Take it a step at a time 87SS . . . maybe get some experience with the turbo on a relatively stock engine and then when that's working, redo the engine to take a little nitrous. . . and then more. Those are my thots, not yours . . .

_________________
Cheers!
Al T

Al T,

I definatly am wanting to build the engine, the nitrous will come after the engine is broken in and used for abit, i plan to build the motor/turbos, then break the motor in without the turbos with just a rebular 4bbl and a regular exhaust manifold thats been modded, then i'll just slap on the turbo's and the linkages, take it to the exhaust shop by trailer and get the exhaust rigged up, then start it with the turbo's and all on to "tune" it and get it going...

If i do the turbo (wouldnt be that hard, already got the turbos and some other things) i'll make a trip to Alberta to show it to you, i'm hopeing for 350HP with the Turbo's at 12lbs boost (or more) before the nitrous.

Justin

I'm having my 225 rebuilt and was looking for forged pistons. The race shop doing the rebuild found .30 over forged but I needed .60 over because my buddy left the motor uncovered and rain and snow got in . Any way, get back to me at streetl@msn.com if you need info . I'll ask who made them.

Thanks bib

I'm only going to need the forged pistons if i do the turbo motor, i was really only planning on running 12lbs boost on it and maybe upping the boost abit later, right now i'm unsure of what WILL make the most power

Justin

I think oversize bearings are good. Chad seems to like them because they are thicker and give more protection to the crank (babbit layer). the thickness absorbs more heat and takes it away from the crank. My new motor has .030 under mains and .040 under rods. Plus there is another secret benefit... can anyone guess?

Secret benefit?

A smaller bearing diameter has less bearing speed, which gives less bearing drag, freeing up HP. I don't think this is the secret you are refering to.

The only reason going to .040 on the rods, unless the crank is real bad, is to gain 2 more cubic inches by offset grinding. I think this is your secret.

Cecil

hmmm, sounds interesting, So running OS bearings can make a motor withstand alittle more and free up some HP?

And is it really worth the trouble to do it? I doubt i'm going to run a turbo motor, i want to run a 198/2.2L bored as big as i can find pistons. I'm wanting to hit 300HP at the crank if its even possible

What kind of pistons would i have to run if i wanted to use Nitrous later on?

Thanks
Justin

Hey Justin, You need to make up your mind, what your going to build. One day its a truck, then a car, normally aspired, twin turbo, single turbo, nitrous. How about alternate fuel, such as propane or hydrogen?

_________________
Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Hey Charlie,

Yeah i know what you mean, truth is day to day i dunno, i "listen" to, too many people on this most of them not slanters, but the twinturbo (my ultimate goal) will not be my first engine build, it WILL however come in down the road I just need to get to know motors more....

I KNOW the 198/2.2 would be a good powermaker to start with (its also most popular), then i'll add Nitrous on it (its only 700-900bux for a plate injection kit around here that will spray gas and no2 so you dont go blowing motors)

SO this is my final desision with this motor (198/2.2L) and no NO2 i should be good for 14's in my truck. (yeah its always been my truck from the start, i was gonna try to find a car to buld and just have my truck as a "stocker")

Is it true i have to use Forged pistons for Nitrous? do they even make forged for the 2.2l?

Thanks for the help all, and the slap on the face Charlie

Justin

Forged piston are not mandatory for nitrous. But they will stand more abuse, if things are not exactly right. Remember a couple of things about nitrous, don't run it lean, don't use a lot of timing. Think of the amount of shot as horsepower per cubic inch. Spraying a 225 slant at 125 hp is the same as some one spraying a 440 at 244 hp. thats about .55 hp/ci, same amount of strain on the motors. Also don't forget, what you save now, you spend later. Nitrous is cheap horse power to install, but you have to fill the tank every week. Twin turbo's on a slant are tottaly unnecessay, unless you just want the WOW factor. The turbo requirements for a slant are small enough, you really don't have to worry about lag. My post was not meant as a slap in the face, Just wanted to wake you up to the fact, you can't do it all. need to decied on one.

_________________
Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

well fellas, i'm going to wait to hear my motor run before i talk about it any more... should be a day or 2 to go....

Charlie,

Yeah, Nitrous is great (my aim would be for a 200hp shot), but the only time i'd ever use it is at the track As for the twin turbo engine, the WOW factor would be amazing compared to a N/A motor. A twin turbo mill wouldnt cost me as much as a regular motor (already have 2 good turbos and have the exhaust 1/2 done with intercoolers), And wouldnt we all love to "have it all" :D:D heck i know i would, but your right, you cant. (hmmm whats the lottery pot this week? )

Anyways thanks again!