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4 cam Shroud Testing has started....I need advice

FM Former Member
Well the shroud is bolted to the motor in it's final state and the motor is awaiting an exhaust. Here is what I plan to do:


The motor:

1914cc freshly rebuilt and needs to be broken in.


Taking reading:

exhaust gas temp on all 4 pipe

have means of checking all 4 cylinder temps

I plan to take readings also with a Bluepoint infared thermometer

I have the stock 36hp fan shroud to use as a baseline.

Tach and oil temp and presure gauges have been installed.

The plan:

I was planing to run the motor for 20 mins on the first run.
taking readings off the motor after 2, 5, 8, 10 , 12, 14,

This needs to be done both under load and at idle... I am not sure which way exaclty first.... I want make sure my fan exceeds the stock one in every way.

Are there any other things I should take into consideration? I should start it on middle of next week...

Once I make sure it preforms I will be taking a unit to Jake Raby (at his convenience) and we will do some other head to head...I am not trying to be an expert but i want to see what I already feel is true and prove that this shroud will out perform any other shroud ever put on a type I motor....

Let's wait and see....any help would be appriciated

Dario
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FM Former Member
Well the shroud is bolted to the motor in it's final state and the motor is awaiting an exhaust. Here is what I plan to do:


The motor:

1914cc freshly rebuilt and needs to be broken in.


Taking reading:

exhaust gas temp on all 4 pipe

have means of checking all 4 cylinder temps

I plan to take readings also with a Bluepoint infared thermometer

I have the stock 36hp fan shroud to use as a baseline.

Tach and oil temp and presure gauges have been installed.

The plan:

I was planing to run the motor for 20 mins on the first run.
taking readings off the motor after 2, 5, 8, 10 , 12, 14,

This needs to be done both under load and at idle... I am not sure which way exaclty first.... I want make sure my fan exceeds the stock one in every way.

Are there any other things I should take into consideration? I should start it on middle of next week...

Once I make sure it preforms I will be taking a unit to Jake Raby (at his convenience) and we will do some other head to head...I am not trying to be an expert but i want to see what I already feel is true and prove that this shroud will out perform any other shroud ever put on a type I motor....

Let's wait and see....any help would be appriciated

Dario
MASSIVETYPEIVMASSIVETYPEIV
Dario,
Idle doesn't matter. with no load the readings will never change enough to make a difference.

I have completed my first round of testing but have another round to go. It will be about 3 months before I go again with another version of the DTM and two more 911 systems to run (had to order them)

The testing is now being done in my Blue bug with all instrumentation. If you send me the shroud I'll test it in this car, and on the dyno with the other systems, and you can come down and watch/help. I really want to see if this puppy makes a difference!

This will undoubtedly save you alot of hassle and will get your results totally compared to 16 different systems with no variables.

we need to talk.

In the mean time I have designed a series of excel spreadsheets with the help of speedy57tub that will make your task easier.

With the testing taking readings accurately at exacting times with exacting loads is a must, else is not accurate information.

I have learned more about this in teh last month than a human could believe. I'm willing to help.
FM Former Member
Dario,

Your shroud looks terrific, no doubt about it. I am always glad to see people with a vision developing new parts.

Jake has recently completed a comprehensive shroud shoot-out, you may want to touch bases with him to see what he suggests re testing. Or perhaps go to shoptalkforums.com and read what has already been posted or invite input from there re your new project. There are a LOT of smart motorheads lurking over there.

Good luck with your project.
FM Former Member
Dario: If you want to be able to correct your data to standard conditions so you can compare it all back to back you will need to know: ambient air temp, air pressure, humidity before the start of each run. I would add incoming air (into fan) temp and individual cylinder temps measured at the spark plugs. Cylinder temps have to be measured under load. Infrared thermometers give surface temps. It is hard to get repeatable numbers with them since different parts of the head will be different temperatures. Under the spark plug is a nice repeatable spot. You may have difficulty getting repeatable numbers with a new motor but if you do the exact same test several times you will probably get an idea of what is going on. Ideally you should test both shrouds a couple of times.

Aren
FM Former Member
Jake,
If it is the spreadsheet that I prepared for you and that you've been using for your test, I am sure he could benefit by using it. If you guys require any mods to the spreadsheet, feel free to let me know and I'll ne glad to help you out.
Regards,
Tony
speedy57tubg
aka LVWOODGOD
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