200ci Degree the cam?

[alwill923]

I put this is dyno sims. I assumed 8.5 CR, your elevation of 5300, a 245 cfm carb (autolite 2100 1.02 as I am putting on my 200), your 40 over pistons and your cam shaft from your post. I assumed stock head and valves.

Without more info and specifics this is the best I can do. Increasing the compression ratio will raise everything some. This is close and anything else will not change it much.

 

[pmuller9]

What is your elevation?

 

[Dustyford]

I put this is dyno sims. I assumed 8.5 CR, your elevation of 5300, a 245 cfm carb (autolite 2100 1.02 as I am putting on my 200), your 40 over pistons and your cam shaft from your post. I assumed stock head and valves.

Without more info and specifics this is the best I can do. Increasing the compression ratio will raise everything some. This is close and anything else will not change it much.

I can’t see the report but my 156 CFM carb should be used in the equation. I have stock head and valves. The only thing not stock is the cam.

 

[Dustyford]

What is your elevation?

5500’

 

[pmuller9]

I can’t see the report but my 156 CFM carb should be used in the equation. I have stock head and valves. The only thing not stock is the cam.

 

[Dustyford]

View attachment 28296

I’m surprised I can get the car up the driveway

 

[pmuller9]

At 5500' elevation the carburetor is most likely running a little rich and could be fine tuned using the A/F ratio meter previously mentioned.
You can pick up some low rpm torque by advancing the cam.

Aside from that, you shouldn't expect much more with that cylinder head and one barrel carburetor when you are at 5500' in elevation

 

[63 Sprint]

You mentioned that the linkage got so hot that you need to wear welding gloves to operate the linkage by hand. After looking at the picture above again, I remember back in the days, the linkage will get hot. Look at the linkage in relation to the exhaust manifold. One thing that will help is, people need to toughen up their skin with calluses. Now days, too many mechanics are wearing gloves and have baby soft skin and their skin is not protected when working without gloves. In garages, years back, those with such soft skin were called having pansy hands. Personally, I cannot stand wearing gloves. When turning wrenches, they slow me down. Sear your hands a few times and you won’t feel the heat as much. And, you will stand less of a chance getting cuts and blisters. Conditioning works every time.

And I have to add, there is a possibility that all of us mechanics that abused our hands do stand a greater chance of getting cancer.

I’m not making fun of anyone that wears gloves. It’s just the facts.

Unfortunately I can’t help anyone if they can’t take a little abuse and joking around.

Life is still good.

 

[pmuller9]

I have a question that has relevance to carburetor size.
What is the intake manifold vacuum at WOT.

 

[Dustyford]

Not sure about WOT but at 2500 rpm it reads 18” I believe

 

[Dustyford]

I have a question that has relevance to carburetor size.
What is the intake manifold vacuum at WOT.

With stock cam, carb, and LODO I had 18” at idle. Now I can’t use a PCV valve because of low vacuum with new cam.

 

[63 Sprint]

Your block may have provisions to install a draft tube from a 170 engine.


The red arrow shows where the draft tube mounts. The engine pictured above is posted as a 1966 200 six.

In order to install a draft tube, the freeze plug is removed.

 

[Dustyford]

View attachment 28310

Your block may have provisions to install a draft tube from a 170 engine.

I removed the draft tube because everyone told me it would keep the oil cleaner and pressure down

 

[63 Sprint]

Oil changes would need to be more frequent with a draft tube. An engine with a non functioning PCV is not able to extract enough crankcase gasses. And if the PVC is not able to draw enough, crankcase pressure could get high.

 

[pmuller9]

I'm looking for the intake manifold vacuum at Wide Open Throttle at around 2500 to 3000 rpm.
It should be under 1" .
If it is over 1" then the carburetor is too small.

 

[63 Sprint]

This is an important question, I think pmuller9 posted this question earlier in post #130.

 

[63 Sprint]

I just thought of something.
I believe your vehicles engine had a draft tube when you got it. The carb spec’d for your specific engine would not be properly tuned for a PCV engine. And you installed another carb. I would highly recommend purchasing an AFR meter and install it as soon as possible. It will help you to tune the carb much easier. Without one you are going to have a rough time getting the carb tuned right.

Please work on getting the vacuum reading at WOT.

 

[Dustyford]

I'm looking for the intake manifold vacuum at Wide Open Throttle at around 2500 to 3000 rpm.
It should be under 1" .
If it is over 1" then the carburetor is too small.

When I slam the throttle the vacuum goes to zero.

 

[Dustyford]

I just thought of something.
I believe your vehicles engine had a draft tube when you got it. The carb spec’d for your specific engine would not be properly tuned for a PCV engine. And you installed another carb. I would highly recommend purchasing an AFR meter and install it as soon as possible. It will help you to tune the carb much easier. Without one you are going to have a rough time getting the carb tuned right.

Please work on getting the vacuum reading at WOT.

Did the ‘68 200 not have a PCV system? I’m trying to do what people tell me but people are telling me different things.

 

[pmuller9]

When I slam the throttle the vacuum goes to zero.

Does it stay at zero at 3000 rpm?