DISPLACEMENT OF A ROOTS BLOWER

[Bigbjorn]

Does anyone in the readership know how much air is displaced per revolution by the Roots blower on a Detroit Diesel 4-71 two stroke engine? Failing this direct knowledge, does anyone know how to calculate this figure?

[WilkoP38A]

Hi

Wiki have a lot of info on it. Not sure if it answers your question though.

Cheers
Rob

This is the link off my iPhone which goes to the mobile enabled site.


Roots-type supercharger - Wikipedia, the free encyclopedia (http://en.m.wikipedia.org/wiki/Roots-type_supercharger)

[awabbit6]

According to this website Ford Flathead - Blowers Superchargers GMC 3-71 4-71 6-71 blown flatheads (http://www.fordflathead.com/basic_measurements.html)

280 cubic inches per revolution.

[Bigbjorn]

Hi

Wiki have a lot of info on it. Not sure if it answers your question though.

Cheers
Rob

This is the link off my iPhone which goes to the mobile enabled site.


Roots-type supercharger - Wikipedia, the free encyclopedia (http://en.m.wikipedia.org/wiki/Roots-type_supercharger)

Thanks for trying. No help or information at all. Only general knowledge that any reasonably informed person would know.

[Bigbjorn]

According to this website Ford Flathead - Blowers Superchargers GMC 3-71 4-71 6-71 blown flatheads (http://www.fordflathead.com/basic_measurements.html)

280 cubic inches per revolution.

This site is blocked. Said to be a phishing site.

[awabbit6]

This site is blocked. Said to be a phishing site.

Here is the page as a pdf.

[roversmith]

Brian, if you ring Bob fisher automotive on 03 97435041 Im sure he would be able to help you. Say Greg from Horsham gave you his number.

[Bigbjorn]

Thanks, folks. Got the info now. Doing some initial planning to blow a Chrysler 265 Hemi Six at about 8-10 lbs over atmospheric for a street rod.

[Stuck]

Thanks, folks. Got the info now. Doing some initial planning to blow a Chrysler 265 Hemi Six at about 8-10 lbs over atmospheric for a street rod.
:rulez:

[rovercare]

Don't be fooled into thinking supercharging is just a matter of squeezing a blower and belts in between the air intake and ports. It is a very complex and frustrating business, take it from me. I suggest you get a text book quality manual and read and absorb thoroughly before starting. If you are going to use boost levels much above 6-8 psi over atmospheric, then you are in for an interesting ride both in the car and on the tools.

..:p

[Bigbjorn]

:rulez:

My job is to put an engine together. I will be driving the blower about 3/4 engine speed which should produce about 8psi boost and hopefully only minor ignition problems which be sorted with a boost retard canister on the distributor. Higher levels of boost in petrol engines than 8-10 psi often make for major problems.

[rovercare]

My job is to put an engine together. I will be driving the blower about 3/4 engine speed which should produce about 8psi boost and hopefully only minor ignition problems which be sorted with a boost retard canister on the distributor. Higher levels of boost in petrol engines than 8-10 psi often make for major problems.


Don't be fooled into thinking supercharging is just a matter of squeezing a blower and belts in between the air intake and ports. It is a very complex and frustrating business, take it from me. I suggest you get a text book quality manual and read and absorb thoroughly before starting. If you are going to use boost levels much above 6-8 psi over atmospheric, then you are in for an interesting ride both in the car and on the tools.

Thought it was 6-8 psi Brian, there is a whole host of posts from yourself about how difficult it is, I hope to see a very concise build up thread