3K Marine govenor spring source?

[rbalcom]

I'd rather change out my VE govenor spring than change govenor settings. I'm quite satisfied with the power output and want to improve drivability... ... does anyone have a spring source and phone number they are willing to share? I have a bosch spring number (1464650366) but have not confirmed if this is valid with bosch. thanks in advance... .

 

[dzlpwr]

I have a large variety of governer springs on order. As soon as they get here I am going to put them in a pump on the test stand to see if they are worth it. I will look up that number tommarro and see what comes up.

 

[rbalcom]

Ordered 3K springs

I just ordered two 3KG springs from Trey's Fuel injection

Temple, TX

254-770-3401

ask for Chris.

i'll post results... ...

 

[BushWakr - RIP]

Just saw this post rbalcom, sorry for not getting in here a bit sooner... .

The number you quote is correct, it is a 3200 RPM governor spring.



Bob.

 

[rbalcom]

VE pump re-rates

Thanks for chiming in Bushwacker!

Is there any additional info you can glean from that number?

Is the application correct?

My cummins injector book on VE pump re-rates shows 2750 max governed for the 4bt and 2770 for the 6bt... . no mention of marine 3k application... .

 

[BushWakr - RIP]

As I understand it, that spring is shown as marine/industrial application.

Since you've already ordered it then you can do us all a favor here... .....



We have been 'theorizing' and talking up this mod. We have one guy on another site who has spoken well of it.

Now, I have made some inquiries myself, from a well respected guy in the business. He is pretty firm in that it will not do much more for "us" than using the "high idle" screw (governor screw).

Now I don't for a moment doubt his word, but I would love to hear your results.

Please, do some runs with your existing system. If you're running an auto do it all in 3rd gear (1:1)

Watch your RPM climb, when does it start to fall off (RPM?) when does it just plain refuse to pull up any further, etc.

Keep close track of it ALL... . add anything, in terms of "test" you can think of, then do it all again with the gov spring changed and NOTHING ELSE.

Right now dzlpwr is going to do some flow bench testing with different springs in our pump and report that back too.

Sometimes what happens on the street is a bit different than what happens on a bench, so anything that shows a difference from stock is important. BTW, one more thing, keep track of EGT's at different RPM's, that will tell us about fueling too.

I DO NOT want to have a bunch of us order these things and find we could have had 90% of the same improvement just by turning a screw.

We all appreciate your help here... I know I do.

 

[rbalcom]

Base line data with 93-4x4-5speed

I have a 5 speed, so I'll set some base line parameters: RPM/EGT/boost/load/no-load conditions in a table format. Maybe someone can do the auto... .



According to my pump book, production pumps vary from 7-10 percent and if you use the high idle screw to re-rate the pump you will increase governor variability by as much as 22 percent..... this is may not be critical, but defueling can vary from 2340-3660 at the high end and may effect idle.

 

[jbolt]

rbalcom- What book are you refering too?



Jay

 

[rbalcom]

My reference: Cummins Master Repair Manual

Injection Pumps and Injectors Midrange Engines bullitin No. 3666037-05 Lots of pump ratings/CPL #s/cummin pt #s..... not very usefull, no internal pump info or spring #s.

 

[roadhawg]

Govener spring test!!

First I would like to say that this pump was a long way from stock settings before I started.

the stock spring I pulled out had #388 on it. I had pulled it before and added a smaller light spring through the center of it.

In this test i removed my old setup and replaced with spring #366. Also I want to say my govener screw is backed all the way flush with the housing but my linkege wont let me get full travel anyway.

Old setup would rev untill 60mph in 3rd gear.

Spring #366 revved to 67 before I chickened out!!!

I was afraid of hearing a piston hitting a valve at any second!

I ordered 60lb valve springs two weeks ago so I'm going to wait untill I get them installed.

I guess I forgot to say I have 3. 54 gears.

I revved it in 4th gear and saw 97mph before I ran out of road, it was still pulling strong!

I cant wait to get the valve springs installed so I can play more

The seet of pants feel ? Truck is waaaay faster , with flicks of the throttle I see 3-4lbs more manifold presure than before . In 4th gear I could pull 42lbs.

I could normally get about 36-38lbs

It takes only about 3 seconds to peg piro guage at 1500 degrees. It seems to do it a little faster.

My general impression is this is a good modification and I recomend it to anyone who wants a few more rpm.

I wish I could give more facts but I don't want to damage the engine.

Oo.

happy bombing!

Eric

 

[BushWakr - RIP]

Eric,



That's some nasty EGT's there bud... ... can you say Chernyobl. .

I have the same gear ratio as you do, and a much tighter drivetrain thanks to DTT, but:

I am currently able to pull right up to about 130 Kph, or about 80 Mph in 3rd. That takes me to about 3000 RPM.

When I kick into OD at that speed my boost blasts right up past 32 psi, and I chickened out at approx 155 Kph, or 100 Mph.

Way to wild a ride for me

My max EGT on that sustained run was 1200*F.



Bob.

 

[roadhawg]

My tack will only go 3000rpm and my speedometer only goes 100mph.

I'm testing with a 5speed so I used 3rd gear because 4th gear I think will peg the speedometer.

4th gear is a 1to1 ratio the same as your 3rd.

I really don't know the rpm but looking at the tack at 2000rpm in 3rd gear, it's about 35mph so i'm guessing 70mph would equal about 4000rpm.

I played some today and revved to 67mph which should be about 3800rpm?

 

[BushWakr - RIP]

Well, plan 1 would be ease back on it...

Plan 2 would be... . RFI !!!!!!! (run for it. . )

 

[Old Smoky]

It looks like we've got another guy to push the limits to see where stuff breaks. Thanks.



Mike

 

[BushWakr - RIP]

Mike, I've had plenty of general conversations with Piers about things like this. Now I know I quote him a fair bit, but that is because I've rarely had the good fortune to meet someone who doesn't always have the almight buck $$$ on his mind.



I also have rarely seen him mess up, or fail to admit when he does.



So... having said that, I have been told by numerous CTD'rs that the upper range for our trucks is about 3500-3600 RPM.

Proof of that is nascar mark, he has run his up to and a tad over 3600 RPM.

Now that is NOT in every day use, but on the track.

I asked if I should by some 60 lb springs, and that got me a question in return... "... how far up do you plan to run it... ?"

I said about 3000-3100, I was told "..... you are okay up that far, you could go safely to about 3300 RPM max before really looking at the 60 lb springs... "

Nascar Mark said he did not detect any float at 3600.

I realize that each truck is different and each spring on each valve is different, and so there will be some variations to this.



I did a no load high idle test... (man that takes some nerve, atleast for me) and I ran right up to 3150 RPM. I could detect NO sign of float. It was pretty strange running that far up with no load though. Spooky...



For what it's worth guys, your 'mileage' may vary.



bob.



edit: mark I do have a couple questions to run by you on some things, remind me next time we talk. .

 

[JLEONARD]

I did a no load high idle test... (man that takes some nerve, atleast for me) and I ran right up to 3150 RPM. I could detect NO sign of float. It was pretty strange running that far up with no load though. Spooky...

Standard proceedure in marine applications... . my new 270 was idled for about 1/2 hour, fluids checked, then no-loaded:--)

Now on a marine engine, this means that the Cummins tech had his nose a few inches away from the balancer with a hand held tach while straddling the engine!



Talk about scary!