Smog pump supercharger

[Thepaetsguy]

model number 100202 from 1963

Everything was just sticky it’s apart now for cleanup. The bore is in awesome shape. cleanup test run in stock form then I still need to order a 24mm carburetor. but this is the engine I’m going to test with as it looks solid. will a 5hp rod fit? Or does it pop up to much out of the bore?

 

[sparkwizard]

Crank, rod and piston will not fit. All different. I tried, that is why I have a spare model 10.
The wrist pin is different.
I also assumed a 4 horse would rev higher because of the shorter stroke. That didn't work out so well.

 

[Thepaetsguy]

Ya know for 1963 I’m not gonna complain. 4hp is in great shape. Now to clean up and service the rest of it.

 

[Thepaetsguy]

Slow progress is still being made. I broke the oil ring so I just ordered a nos piston/ring assembly and also a gasket kit.

I’ll run it in stock form with the tank carburetor and once everything is dialed in I’ll stick the smog pump on it.

 

[sparkwizard]

It'll be a shame to blow up such a nice engine.

 

[Thepaetsguy]

It'll be a shame to blow up such a nice engine.

Thank you!! I’m still under $50 with this 4hp engine and alot of the fresh painted parts fit the 5hp block. So if this one blows up no matter I’ll paint up another one. I wondered about putting a 5hp head on this 4hp to lower the compression in case it makes any kind of boost with the pump? kind of like a bigger chamber head I guess.

 

[sparkwizard]

The head will bolt on if you need less compression.

 

[Thepaetsguy]

I ordered a tm24 flatslide to fit to the pump. The carb and piston/ring assembly will both be here the 22nd according to tracking. I’ll be picking up a belt tomorrow.

The only reason I can’t assemble it now is the broken oil ring.

 

[Thepaetsguy]

So there might be a chance these pumps could actually make boost

 

[Thepaetsguy]

I just now figured out that the I/c 5hp starter cup pulley centers itself over the bolts of the original smog pump pulley. I can now run the pump at a one to one ratio. I’ll drill some holes in the metal pulley and the plastic one will bolt right up.

Edit: yes I have two I/c starter cup pulleys in house

 

[sparkwizard]

Not sure if you remember me saying this, but I have mounted one below a mini bike seat, ran a belt from the rear wheel and it DEFINITELY went faster than it did before.

 

[Thepaetsguy]

Smog pump from an MG making 3psi

This pump is most likly being tested in stock form. There are 5 holes in the pump casting I intend to plug with jb weld. And I do not know the size of the driver/crank pulley he is using but I could see the stock size pump pulley.

I’m really hoping that sealing the pump with some JB weld a gasket for the backing plate and overdriving it makes a bunch of psi. I wondered if I could rig a 5lb rad cap in place of the face of the MG smog pump diverter valve.

 

[sparkwizard]

Radiator cap is a good idea.

 

[Thepaetsguy]

Radiator cap is a good idea.

Your previous posts made me think about actually trying it. I need to file two slots into the diverter face and see if the cap will twist on.

 

[sparkwizard]

Glue the little flapper valve shut in the center of the cap or it will leak air.

 

[Thepaetsguy]

that’s a nos 4hp headgasket that showed up with the tm24 today. I’m still waiting on the piston/ring assembly and a 5hp gasket kit. I need to go get the belt.

 

[Thepaetsguy]

 

[sparkwizard]

If you use a radiator cap you need to provide a path for air to escape if it releases. Radiators have a little hose under the cap.
I like the clear hose.

 

[Thepaetsguy]

Grind hard plumbing ran 10psi from an amr300 and the very second he hit the throttle boost stuck the slide carb at wide open... I am now working on a tilly HR intake for the pump.

Heck I don’t know what to do about that at the moment honestly... We all know that slide carbs have the spring in the carb body.. maybe I could double or triple up the springs inside the carb body to force it to return?

 

[sparkwizard]

Was he using blow thru? That might blow the slide open.
Draw thru, it should not be a problem.