Bruceynz
Well-Known Member
Merry Christmas Everyone! Thanks for all you help and advice over the year!! Have a safe and Happy New Year! Its summer down under and we have Christmas and summer vacation all in one, I finish work on 23rd Dec and not back until 9th Jan.
Ok Guys I go around in circles now and then, this is one of these times. I was trawling through the net and come across a 360 smogger build up. Here is the article here actually Dyno-Test 360 Smog Motor - Mopar Muscle Magazine
So this article got me fizzing at the bung, why does my 360 not perform well? From this article even a smogger can make ok power. Get some comp into it and even better power one would think!
Ok lets start with the trans, my friend from Oz is over on holiday, he has been mopar guy all his life, he has set up the kick down linkages many times before and said they are a right pain in the but, his current 440 uses a lockar cable system. Anyway he checked my set up, we checked the linear travel, I was under the car and he was working the throttle and checking the position of butterfly while I was under there looking at the lever on the trans telling him where it was pointing, his conclusion, "got me beat its set up perfect, couldn't have got it any better myself" so he says the A998 lock up has a problem, I said is it possible its got some sort of economy change points in it, it just wont go over about 3600-3800 1st to 2nd shifts so there is problem 1. I can manually shift it but I did that at 4000rpm the other day and the change was rather drawn out like trans was slipping. It just didn't bag through quick.
I got the vacuum gauge out last night and took some measurements, see attached photos.
So that's 12 inches at idle at 850rpm. give or take the accuracy of the needle thickness, but would be pretty close to 850rpm.
Now what does this suggest, will let the brains see what they think, but to me its got a reasonable cam in it, something like 1800 - 5800 or 2000 - 6000 or their abouts its got quite a rough idle but not what I would call lopey. Gets some revs on and it smooths out nice.
My igniton timing is at 34 degrees, I think I could probably get some more into it, maybe 36?? or 38?????
Now carb size, all the calculators seem to say 600cfm should be fine, but most of the articles I read seem to dump a big carb on a 360, say 800cfm, I have a 770 cfm street avenger would this be worth a try on it? Does a 360 just love a big carb? There are always funny things that can happen in an engine in the runners and how the heads load the fuel in, its to do with piston speed, stroke and how much the engine pulls in.
I am running an edelbrock performer intake and they have the 318 size runners/ports, should I be looking at a performer RPM with the 360 size ports to dump the fuel in?
** So for starters I need to get the trans sorted, with 12 inches or mercury that would suggest a stall converter of 2200- 2300 rpm? TCI offer a rebuilt 904 with a 300- 400 rpm over stock stall with a 350hp rating as a kit for about $1400 I think I saw.
Street Rodder™ Transmission Pkg: '67-Later Torqueflite 904 (318, 340, 360) - TCI® Auto
I think I can dial in some more advance too
I think I may need a bigger carb, got the 770 street avenger there.
Would I be unrealistic to think It would be possible to get 350hp out of a smog 360?
Merry Xmas and Happy F J M bodying!
Bruce
Ok Guys I go around in circles now and then, this is one of these times. I was trawling through the net and come across a 360 smogger build up. Here is the article here actually Dyno-Test 360 Smog Motor - Mopar Muscle Magazine
So this article got me fizzing at the bung, why does my 360 not perform well? From this article even a smogger can make ok power. Get some comp into it and even better power one would think!
Ok lets start with the trans, my friend from Oz is over on holiday, he has been mopar guy all his life, he has set up the kick down linkages many times before and said they are a right pain in the but, his current 440 uses a lockar cable system. Anyway he checked my set up, we checked the linear travel, I was under the car and he was working the throttle and checking the position of butterfly while I was under there looking at the lever on the trans telling him where it was pointing, his conclusion, "got me beat its set up perfect, couldn't have got it any better myself" so he says the A998 lock up has a problem, I said is it possible its got some sort of economy change points in it, it just wont go over about 3600-3800 1st to 2nd shifts so there is problem 1. I can manually shift it but I did that at 4000rpm the other day and the change was rather drawn out like trans was slipping. It just didn't bag through quick.
I got the vacuum gauge out last night and took some measurements, see attached photos.
So that's 12 inches at idle at 850rpm. give or take the accuracy of the needle thickness, but would be pretty close to 850rpm.
Now what does this suggest, will let the brains see what they think, but to me its got a reasonable cam in it, something like 1800 - 5800 or 2000 - 6000 or their abouts its got quite a rough idle but not what I would call lopey. Gets some revs on and it smooths out nice.
My igniton timing is at 34 degrees, I think I could probably get some more into it, maybe 36?? or 38?????
Now carb size, all the calculators seem to say 600cfm should be fine, but most of the articles I read seem to dump a big carb on a 360, say 800cfm, I have a 770 cfm street avenger would this be worth a try on it? Does a 360 just love a big carb? There are always funny things that can happen in an engine in the runners and how the heads load the fuel in, its to do with piston speed, stroke and how much the engine pulls in.
I am running an edelbrock performer intake and they have the 318 size runners/ports, should I be looking at a performer RPM with the 360 size ports to dump the fuel in?
** So for starters I need to get the trans sorted, with 12 inches or mercury that would suggest a stall converter of 2200- 2300 rpm? TCI offer a rebuilt 904 with a 300- 400 rpm over stock stall with a 350hp rating as a kit for about $1400 I think I saw.
Street Rodder™ Transmission Pkg: '67-Later Torqueflite 904 (318, 340, 360) - TCI® Auto
I think I can dial in some more advance too
I think I may need a bigger carb, got the 770 street avenger there.
Would I be unrealistic to think It would be possible to get 350hp out of a smog 360?
Merry Xmas and Happy F J M bodying!
Bruce
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