Torque & HP Open Discussion

Those elbows would probably be more restrictive than Alan's. Which negates the whole purpose of the exercise. From memory that is probably why the Edelbrooks flowed better in the first place.

Alan don't forget to make sure your exhaust flaps are in good condition. The log style of manifold is more prone to a backwash without the riser section.

Alan have you reworked the elbows, look at my elbows on my SBC Edelbrocks.

I don't believe that the feed to the mainfold is correct it should have been to the lower fitting, forcing the water up and out, the way it is currently, air pockets can and will be created, and that's not good read cracked mainfold hydro-locked motor. The way it currently is plumbed is not good for flow or thermal transfer characteristic nor will it help purge the system of air within the mainfolld.

also I would try varying the amount of flow to the elbow and watch how the flow changes as it exits the elbow, try using the other fitting to the elbow and see what effect that has, use both fittings and check the effect that has, but I believe your going to need to use both ports of the elbow to cool it properly this will force water over the top of the elbow and provide much better thermal tranfer to the water.

you have to slow the flow on these manifolds down, your creating a spray internally automaticly from the reduced dia of the fitting, so feeding at the same pressure thru the same 1" hose is not good, 1" ID hose goes into a 3/8" fitting can you say nozzle because that is what is happening.

there is much more to a water jacket design than meets the untrained eye.

Luchog wrote: what happened to the "airline" or something alike? I still got some pics of a boat waay loaded with people and a Big block engine. Is that Matrix boat a Malibu splash???

The "airline" caused a huge controversy in the Wake community over here. Lots of rumors etc they never really hit the market a few were built though. I think somebody else has the moulds now maybe we will see something eventually.
The Matrix are a quality boat. I looked at them just before I imported my 89. They compare very well to a Malibu Sportster or Response same price as Sportster but size and fitout of Response. My favourite is the Sorrento closed bow which is a great ski boat that has sub floor floodable ballast that pumps out a good wake for its size. Just could not justify the AUS$45000 investment. I like the size and crossover capabilities because we do a bit of everything but are not good at any of them

what happened to the "airline" or something alike? I still got some pics of a boat waay loaded with people and a Big block engine.

Is that Matrix boat a Malibu splash???

My Commander style manifolds were paired with a 90 degree Piece so not a direct comparison I am afraid. I am sure there is something that can be done for more even flow, maybe even a simple diverter on the end of your hose fitting might help. But I think someblue silicone high temp exhaust hose might be the real trick.

Looking good though, and your exhaust temperature might change a lot with tuning so I wouldn't be getting too concerned about the hose temp yet.

Andy wrote: If you have no one local, I haven't found anybody that I liked. you could give these guys a shot. They're on the east coast somewhere I think. I've gotten some things from them in the past, always easy to deal with, and I've gotten some off things. Mandrel Bending solutions

Thanks Andy, may come in handy

Lewy, I made a template today of the elbows I need and I hope to find someone local that can bend up a set of stainless elbow. I think once I install those I'll be ok, just don't ever recall the hoses getting this hot with teh PCM manifolds. I have s few other options if these don't work out the way I want them to, few more weekends and we'll see.

I still dont think you'll burn the hose.

Some of the old v drive guys had this same problem.The answer they came up with was plumbing both sides of each elbow.Of course they also had alot more space than we do under the doghouse.

Nice job on your motor Allen very well laid out and detailed.Really like your plug wire
routing.

Munday

Can you block off a portion of the bottom part so it will be redirected to the top part of the outlet. Does the hose from the front cool the manifold and dump out the top of it .
Is the inlet you are testing the extra water from the rwp . that doesnt go through the engine ?

Luchog wrote: I had that rubber smell/smoke when I replaced the hose after my manifold repair. It was gone after a few outings.

Actually if you look closely at the last photo you'll see that the exhaust hose is at a bad angle to the elbow outlet, I think I simply have a hot spot on the top on the hose because things aren't lined up correctly. I planned to replace the corrugated hose anyway but just haven't gotten to it yet.

I also made an adapter for the A/F sensor to fit the Edelbrocks, (nice having friends with an EDM machine)you can see it with a temporary plug on the starboard side. Hopefully once I get the cooling issue solved I can see how that works.

SNobsessed wrote: Alan - Your engine is a work of art!

its a dali...
good work there...

Fired up the 81 today, started right up and sounds pretty good. Wasn't able to tune it much as I still need to finish the exhaust system and I'm trouble shooting why my exhaust hoses are getting so much hotter than the manifolds. Strange issue is the mainfolds are running at less than 100 degrees but the hoses are about 220, hot enough where I could smell them. The motor itself is runnign at 140 so it's not over heating, just the hoses are hot and plenty of water out the exhaust.

Anyway here's a few pict of the progress.

Well it's been a very slow winter for me boat wise, like many of us work is the priority and it's eaten up my spare time. I'll never get to the manifold flow testing but have made progress port matching the HM manifolds and the new intake.

One thing I really wanted to get accomplished was to make an adapter so I could install an air/fuel sensor to plug into an Innovate Products wide band controller so when I get the top end of the motor put together I can do some real tuning.

After a few trips to my buddies machine shop during lunch hours we came up with this. Should do the trick, it is intended to mount between the manifold and riser. This particular one will fit the PCM Manifolds as thats the exhaust that going back on the boat until I finish working on the HM's. I hope to have them on before Green Lake for the bling factor.




Once I switch over to the Hm manifolds I would make this and the controller available to anyone with a PCM setup that wanted to tune their boat.