ultimatejay

Hi guys, I am getting real close to putting my 12a bridgeport back together and I have done the front and rear oil pressure mods. I was wondering if I should also use the e-shaft 200 jet mod also? Both Mazdatrix and Atkins say not to use these jets on the street and I was wondering why not? I will be running on the street and strip.



Thanks,



Jarrett

ultimatejay

I think I found my answer after about an hour of searching and reading. I will have low oil pressure at idle and thus it is not recommended for street use. However, I am running a bridgeport so my idle will be around 1000-1500 rpm's, so could I get by using the 200 jets on the street?

Lynn E. Hanover

The jet mod is to reduce the amount of oil sprayed into the rotors because you have raised the oil pressure from the stock 71.7 PSI to over 100 PSI. The 200 jets do this to some extent because it adds a second orifice to the path rather than just removing the ***** and springs and leaving the stock jet in place. This stil leaves a bunch of oil going to the rotors. The excessive oil does not help rotor cooling as it adds more foamed oil to the sump.



I have a dry sump system and more than adequate oil cooling. I use 180 Weber main jets in all of my engines. If you can keep your oil temps below 190 I would recommend 180s. Racing oils have extra antifoaming additives to help with this problem. My engine idles at 2,200 RPM and would be useless on the street.



Lynn E. Hanover

ultimatejay

Thanks Lynn, you sure have a vast knowledge of rotaries and what's great is that your willing to share this to the community. There are alot of guys out there that don't. I am a mechanic myself for 13years- Mercedes- and this is going to be my first rotary rebuild. I have learned alot by reading and asking questions in the forums and there is something new learned everyday and you are a great part in it, so thanks.



Jarrett

Lynn E. Hanover

Any question, anytime. No problem. I am getting too old to be racing or rebuilding cars every weekend.

We have a house in Zephyrhills Florida now, and most of the winter will be there hiding from the cold here in Hebron Ohio. The hebron house has a nice shop out back, but the Southern command house has none, yet. So much work is required there as money becomes available. The driver retired last year, and I sold one race car (first gen tube frame Pport) and the last car is for sale cheap (tube frame third gen bridgeport. The one in all of those pictures. Once that is gone I have an airplane kit to build,

rotary powered of course. I will still build engines and transmissions on occasion. Otherwise I will help Mike Shank at his races in Florida (Datona Prototypes cars 6 and 60). I have a head full of information that is not being used much, and costs nothing to pass around.





Lynn E. Hanover

ultimatejay

That's too bad on the racing. Well, we all get old one day. I am catching up too. What kind of airplane kit are you building? Full scale or R/C? Actually my main hobby is flying 42% scale airobatic R/C airplanes. My Dad does most of the building as he is retired now and I do the flying. It's amazing what you can do with the R/C aircraft nowadays with the power to weight ratio more than 2-1. I can hover my airplane like a helicoptor! My dad also has a turbo V-tail bonanza and has been flying full scale since I was a youngin. I never got into the full scale flying.... I get sick too easily. LOL.

Lynn E. Hanover

Its a full size BD-4. 4 place all metal. I saw Sean Tucker hover his full sized biplane at the Sun&Fun airshow last April. Also the new F-22 did the same thing. It also did a front and back flip out of a hover.



The pilot put it into burner and set off every car alarm within 10 miles. It was love at first sight. Its amazing what you can do with 100 million.



Lynn E. Hanover

ultimatejay

That's bad ***. Sean Tucker is an awesome pilot.

RE_TurboFB

A check and ball assembly is located beneath each jet. For race applications remove and discard these restrictive assemblies.

Press a weber carburetor jet (weber part no. 77401.200) into the back side of each stock oil jet you have temporarily removed.

The jet size will be effectively reduced to 2.00 mm: however, the actual volume of oil flowing through these modified jets will increase, thus providing improved rotor cooling. If the race engine you are building is a high horsepower turbo application you will need to use jets sized around 2.20 mm.