phazer fuel injection question

[thetruck454]

I was wondering if any one knew the flow rate of the fuel injectors used on the phazer and what the rail pressure should be. I think the rail pressure is 43psi, but I'm not sure. Also does any one know the max duty cycle on the injectors in stock form?

Thanks

 

[miked]

According to the service manual the fuel pressure is 42.7 psi.

Mike

 

[thetruck454]

I found that in the service manual, but thanks though. Now if i can find the injector flow rate and the duty cycle on them

 

[Lococoin]

you can always get them flow tested at a fuel injection test shop. They might be able to give you an idea on duty cycle as well. On the aftermarket ones i have on my car, they say not to run them over 90% too long. Not sure if that helps though.

 

[cannondale27]

If we know the rated HP should be able to come close to rate.

If you scroll to the bottom you will find a calculator.
http://www.rceng.com/technical.aspx

 

[thetruck454]

If we know the rated HP should be able to come close to rate.

If you scroll to the bottom you will find a calculator.
http://www.rceng.com/technical.aspx

I was thinking of using s calculator, but I'm running the motor off a aftermarket ecu called Megasquirt. Because of that I think I need the exact flow rate of them so i can put that into the tune

 

[cannondale27]

Sorry not sure where thats available.Might just have to get it flowtested.Are you doing a SAE experiment?

 

[thetruck454]

Yea, the Clean Snowmobile Challenge

 

[cannondale27]

Cool!Good luck.

 

[thetruck454]

Thanks!

 

[asrx600guy]

I assume your looking into E85.

might as well bump the compression while your at it to take advantage of the extra octane rating

I don't see why higher pressure wont get you there.

50 - 60 is easily doable and should be enough for your purposes given 43 is stock

you might want to look into getting the cams ground down a hare for less overlap.

of course a cat is virtualy mandatory to be remotly competitive and will help quiet it down too.

maybe a tunnel exiting exhaust would be quiter also.

 

[asrx600guy]

saw this link elsware on the site. maybe something to consider for next year

http://www.snowmobile.ca/mha_internal/a ... hp?sid=431

 

[thetruck454]

I assume your looking into E85.

might as well bump the compression while your at it to take advantage of the extra octane rating

I don't see why higher pressure wont get you there.

50 - 60 is easily doable and should be enough for your purposes given 43 is stock

you might want to look into getting the cams ground down a hare for less overlap.

of course a cat is virtualy mandatory to be remotly competitive and will help quiet it down too.

maybe a tunnel exiting exhaust would be quiter also.

Actually you nailed almost what we were going for. We do plan to raise the rail pressure to 60psi and that should give us enough room for the ethanol. With these sleds running at 11,500 rpm and running 12.4:1 compression ratio I assume I can add lots of timing with E85. We have a cat on there and are infact making the exhaust exit into the tunnel to muffle it. As far as engine work goes... that may hold off. Our university doesn't have any engines program, and the sled is gonna compete for a 3 or so years. Maybe the next teams can worry about changing the comp ratio/optimizing the cams.

You wouldn't be on a CSC team would you?

 

[asrx600guy]

If I was I wouldn't be so helpful

I graduated from Michigan Tech a year or 2 before the CSC started. but I work on my sleds in the SAE shop many times if that counts.

Changing compression is just measuring clearance and milling the head, there might be some high comp YZ pistons that would do it for you easier.

I believe I read someware (maybe an article on last year's CSC) that winter E85 is actualy closer to E70, something to keep in mind.

I'd just get an extra set of cams and try to talk a race shop into grinding them for you as a donation. maybe just indexing the cam timing would help some. but then you have to leave 'em something to try the next 2 years

 

[thetruck454]

If I was I wouldn't be so helpful

I graduated from Michigan Tech a year or 2 before the CSC started. but I work on my sleds in the SAE shop many times if that counts.

Changing compression is just measuring clearance and milling the head, there might be some high comp YZ pistons that would do it for you easier.

I believe I read someware (maybe an article on last year's CSC) that winter E85 is actualy closer to E70, something to keep in mind.

I'd just get an extra set of cams and try to talk a race shop into grinding them for you as a donation. maybe just indexing the cam timing would help some. but then you have to leave 'em something to try the next 2 years

Yea you are right about the winter E85. I think its some where around E70-E75.

I was at the competition last year as a junior and Michigan Tech has quite a facility there, they had a F250/350 up on the lift with the rear diff apart installing a locker. The best part is we got to watch people test out snowblowers... and the Lotus Elise that was there;-) What amazed me last year was when Michigan blew their motor in the FST Polaris (I think it was a spun rod bearing, but I don't remember) the very next day she was rebuilt and ready to go. It doesn't mater if they were competition or not, that was quite impressive.

If we do anything to the motor it would be just to raise the comp ratio for this year. I assume all we'd do is clay the pistons to see how much clearance we have and just have the university machine shop mill the heads a bit. Assuming we don't take much off, there shouldn't be issues with things lining up