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Chris- a slight off-topic question. Where did you get that double-sheave pulley? I'd like to upgrade my power output so I can run MORE accesories!
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Mess, you must be seeing things, I don't have any double groovers. But I have thought about searching out the pieces from various junk yard motors, to put a multi-vee serpentine system on. I THINK it would be doable, but I would have to pack a lunch, it would take all day to check LOTS of pulleys.Comment
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It looks like there are two belts with yellow writing on them in your 1st engine compartment pic- maybe I have double vision. I heard the M37 has a triple sheave pulley set- perhaps something can be done with that.Comment
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Just two rows of writing on the one belt. It figures that the details you don't want to show come out in the sharpest focus.Comment
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Headerfold Final pics
Here's a couple pics of my set of headers and intake. This post is with the Carter B&B 1bbl. I used Duplicolor 1200 degree header paint on the int and ex both. The ex tubes turned black within three miles. I like the two-tone look, but was worried about touch up. Looks like I got the two tones from the same can .
Rather than restrict my header design to what fits under the stock iron intake, I went with big bends, leaving room underneath for valve adjustment access. Then I had to make the intake, since the stocker wouldn't fit. I figured loooong tubes were better anyhow, and lengthening the center runner would help somehow, some where.Comment
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pics?
Chris,
I used this stuff on my temporary used manifold (aluminum 2000 degree) and it has held up very well, no discoloration at all.
http://www.hirschauto.com/prodinfo.a...er=EMPT%2DPINTComment
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Btw
they look great, can't wait to make mine someday!Comment
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Headerfold, plus Carter 2BBl BBD carb.
Note how the ex tubes have turned colors?
Anyhow, with the int and ex tubes, the B&B 1bbl was restrictive enough to make 2 inches of vacuum at full revs. So I went to the Carter BBD two bbl, from a 71 318 van.
The two-to-one adapter was fun, got it right the first time. But the Z-bar linkage had me tearing my hair out. I wanted to use the stock linkage as much as possible, rather than adapting to a cable. Plus I needed the height of the adapter to make the air filter rise over the tie rod.
Anyway, runs like the proverbial primate with the striped posterior now, except won't idle well. It's straight from the junk yard. I've got a kit coming in later today. Plus I can leak check my adapter with WD-40 once the paint hardens upComment
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Boy, did I overthink that one!
On the last 'heqaderfold' I made, back in '82, I simply welded an arm on the right end of the throttle shaft. LOooots less Rupe Goldberg engineering needed on that option.Comment
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Chris,
impressive engineering indeed! The color shift on your header paint is impressive, thought it would flake off rather than just turn black.
Is that the stock horn for a PW you have there? I plan to replace mine with an airhorn from a 50's era Mack truck, just in case people don't notice me on the road!Comment
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I'll try to get this iteration to the dyno next week. But I have recalled a possible major variation that I used back in '82, in case the dyno does not show my expected gain. It will necessitate a whole new intake that takes advantage of the lower profile of the 2bbl. We'll see.
Re the horn, it is stock. But a short one was too. I like the low, classic sound. And it seems plenty vocal. Maybe because it is a 6v tuned to run on 12v?Comment
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would love to hear it, the stock horn on my M43 is loud, but too tinny for my tastesOriginally posted by chriscase View PostComment
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Chris- Nice aircleaner- always go with as large a dia and as tall that will fit. What did it originally come from? I've never been a fan of 2 into 1 carb adapters- they tend to cause a lot of fuel dropout, especially the short cast affairs. How about running 1 tube for each barrel straight down into your manifold plenum to get the height you need? You'd have to rework the top, but I'll bet the restriction reduction might be worth it. Siamesed intake ports tend to cancel out individual port pressure waves, so the traditional intake wave tuning is less effective- restriction reduction is the biggest bang for the buck. Hopefully your dyno gains will be impressive. The last version of the 230 supposedly got 120 hp with 8:1 compression and the 1959 head with better valve pocket shape.Comment
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I think the truck cam is the limitation at this point. There is just not much you can do with no duration, no overlap.
The filter housing is off of the same van 318 as the carb.
My adapter goes from the two 1 1/2 tubes to the one 1 3/4 that is the 'plenum'. The choke point is the two 1 1/8 venturis, as opposed to the old 1bbl, with 1 1/4". I can't make two 1 1/2 pipes fit into a 1 3/4 plenum, can you?
Flat/short adapter plates don't work in many apps. Too obstructive, even if they are just a flat plate over a large plenum. Entering a box like that can also be restrictive to air flow. I've learned some air dymnamics from autos, and some more from dust collection systems.
My previous headerfold escapade was on a 1/2t command car, with plenty of head room to turn the runners upwaqrds into an exhaust header type collector. I believe there was some ramming of incoming air directly into all of the runners, and less of the suction form one runner pulling charge out of the other runners. If I don't see the gains from thei adaprtive system, I'll have to try and kink some more spagetti into a collector, rather than the 'plenum' that is really a four way tee.
Anyway, when revved to full speed, in 3rd gear, the 2bbl barely makes manifold vacuum. Ought to be a big improvement over the restrictive 1bbl.
Oh, I had some idling probs that went away when I changed from the new slant 6 PCV valve to the junk yard 318 valve. Perhaps they have to match carb more than displacement?Comment
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How about fabbing a small box at the junction of the 3 intake tubes large enough to accept the 2 1 1/2" dia pipes from the carb?Comment
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