Dhadley, two 78 crossflow questions

[Ranger 330V]

I have two simple questions for you. I have read that a crossflow can run without the air silencer and not be in danger of a lean condition?? Is this true?? Do you think I would pick up any response upon removal? I think I read somewhere that it would not hurt the crossflow but it will hurt the looper. I figure it would probably have a nice sound to it also. I am running a 78 140 crossflow by the way. My second question is on fuel filtration. I am running a 3/8" clear paper filter on my fuel line. Am I harming anything by using this?? I like the idea of have a media besides a screen filtering my fuel but does that allow all my oil to pass?? I have had people tell me it isn't which has me worried. I don't see how it would stop the oil though. For one, a much heavier weight oil ie...motor or hydraulic is filtered with paper media although at a much higher pressure. That and the fact that our 2cycle oil is so well mixed in with the gas I do not see how it would stop any of the oil. Just wondering your opinions on these two things. Thanks alot.

 

[Ranger 330V]

Re: Dhadley, two 78 crossflow questions

ttt, anyone else?? Thanks alot!

 

[tashasdaddy]

Re: Dhadley, two 78 crossflow questions

i'd rather see a fuel/water separator filter.

 

[Ranger 330V]

Re: Dhadley, two 78 crossflow questions

I have seen those, but I was worried it would drop my fuel inlet pressure down to much. Do I need some sort of pickup pump in front of the separator?? I have seen this on dodge diesels many times. They use a pick up pump on the firewall that has to pull fuel from the tank. This puts a large strain on the pump and they lose pressure and die often. I know we are talking about an entirely different beast here but same idea. I have switched everything over to 3/8" stuff for volume, I have read that some don't think the 5/16" doesn't hold enough volume. I had thought about putting a regulator and small electric pump in the boat and set it 2-3#s of psi. What do you think of that idea?? I like the idea of a constant flow and no diaphram to worry about. Thanks again!

 

[ezeke]

Re: Dhadley, two 78 crossflow questions

If you use the full sized water-separating fuel filter from any major outboard manufacturer, you won't be restricting the flow. If you go to the Sierra Marine site, they have the flow studies for their filters. http://www.teleflexmarine.com/homepagePDFs/usafiltrationbrochure.pdf

I can't speak for Dhadley of course, but I have seen the question about the carburetors many times and the answer was the same on every forum including this one: The covers are needed and the engines should not be run without them.

 

[wilde1j]

Re: Dhadley, two 78 crossflow questions

I, also, am not DHadley, but wouldn't run either w/o a cover.

 

[Dhadley]

Re: Dhadley, two 78 crossflow questions

Wierd - I responded to this yesterday but it's gone .....oh well.

Yes, you can run without the silencer cover on a crossflow but I wouldn't. You might - might - pick up 100 rpm, maybe not. As for the inline filter, it'll be OK on a crossflow V4 but I'd run the water seperator as mentioned. Don't run the inline filter on a V4 looper (or larger) or on a V6 crossflow.

 

[walleyehed]

Re: Dhadley, two 78 crossflow questions

Dhadley...I responded today...made some comments about not thinking I was you and it vanished too....

 

[Dhadley]

Re: Dhadley, two 78 crossflow questions

Voodoo in the water...........

 

[Ranger 330V]

Re: Dhadley, two 78 crossflow questions

one more quick question for you....if I was to take the air silencer off...could you bump the jet size up a size or so to compensate for little added air?? That would take care of the lean condition. Too much air for mixture, means lean...bigger jet, more fuel/oil for mixture. Would gain any benefits from this?? I figured if anyone has played with these setups you have. Thanks again. Oh yeah...maybe someone on the site opened a "bermuda triangle" forum. Maybe all your lost posts will be there??

 

[Dhadley]

Re: Dhadley, two 78 crossflow questions

We'll have to check the B T forum.........

The 78 140 ran pretty rich anyway but a lot depends on your set up now. I'd be more concerned about the in-line filter creating a fuel flow restriction above 6000 rpm than anything.

 

[Ranger 330V]

Re: Dhadley, two 78 crossflow questions

I have it on a ranger 330V...17' bass boat. 21" renagade prop...6"jackplate, right now about 1/2" above bottom of transom, didn't have time last year to play with due to cold weather. I run about 5500rpm @52mph gps. Didn't have time to mess with the trim or jackplate any that day. I also have replace all electronics except coils...all CDI components. I have the coils now. just not in yet. I still have the green coils on. I had a plug wire come out of one that day also. They are in pretty bad shape from the way they look. I wonder if the newer design black coils from CDI will make much difference?? I also rebuilt carbs and run seafoam. Have not done a major decarb but will next week when I go out...with 2 gallons of gas and bottle of seafoam. I think if I come on up with the jackplate and use the rest of my trim I could get another couple 100 rpm. I hope the coils will help some also. I have read alot of your research on coking on these engines. Should I try to get closer to 6000?? I do run sea foam religously. Just don't want to overrev the old girl...I do enjoy running her. Has an awsome sound when she gets up on plane. Also runs about 100psi on all four cylinders. These old crossflows really intrige me. I know the loopers are supposed to be way better engines but there is something I like about older engines...there is a reason they are still around after 30 years. Where do you think I should go with my setup? Thanks alot! Glad the triangle didn't get your last post!

 

[Dhadley]

Re: Dhadley, two 78 crossflow questions

I'd run it some more as is when it gets warm enough. If the motor wasn't winterized you might need to clean the carbs but I'd see what it'll do as is before moving the jackplate etc. 5500 won't hurt it but don't prop it out for any less. 5800-6000 is a good target.

Personally I like the CDI stuff. The coils may not be any more "powerful" than the OE but I bet they last longer.

Get her back in the water & trimmed out. Once we get a good baseline it'll be easy to figure out the next move.

BTW -- "over-rev" a 2 stroke? As long as there's any load on the prop it'll be fine. Remember - this ain't your Daddy's (4 stroke) Oldsmobile.

 

[Ranger 330V]

Re: Dhadley, two 78 crossflow questions

I know you are the best reference on these...everyone around here mechs and all talk about 6 being to high it'll blow...so 6 is okay?? You saying its okay makes me feel a bit better...I do run her a bit rich on oil though...I'd rather replace plugs than anything else. Thanks alot for your time...I'll let you know how it comes out.

 

[Dhadley]

Re: Dhadley, two 78 crossflow questions

6000 is OK. I hear people say that all the time but if the motor is running properly it'll be fine at 6000. That ol crossflow is nothing more than an air pump. The stock steel reeds will give up (flutter & quit flowing right) in the low to mid 6000 range. Replace them with Boyesens and it'll go right on up to the high 6's. Couple other changes and on stock port timing it'll get into the low 7000 range.

 

[Ranger 330V]

Re: Dhadley, two 78 crossflow questions

I have often thought about boysen's...I have heard they do not idle real well, will I pick up anything from them if I stay at or below 6 grand?? What about timing? I used the Joe Reeves way...set it at 20 by cranking...isn't it true I'll get the other 4 degrees of advance while running?? I know my old 1150 was VERY particular about timing. I set it at 21...showed to be 27 from factory...liked to ping if I was over 21 degrees.

 

[Dhadley]

Re: Dhadley, two 78 crossflow questions

Joe's way is a great way to set the wot timing initially. You still need to check it under a load. The Boyesen reeds let the motor idle very well. Maybe better than the stock steel reeds. The transition thru the rpm band is smoother. They're real good but not a "must have" right now.

 

[Ranger 330V]

Re: Dhadley, two 78 crossflow questions

Sounds good...what is the best way to do this with a load?? Hang on and get the buddy to run the boat across the lake?? I've heard of that....I have a mech not far away that has hydraulic prop loader...I figure that would be the best way?? What have you done? I'm going to get a water separator soon also. I know they are a must in diesels...and we are floating....so. I think I'm going to get a 12v fuel pump also and regulate it to 2-3psi...what do you think of that?? put the separater/filter, then pump, bypass diaphram pump and plumb everything with 3/8 hose. I would figure that setup would provide plenty of fuel for whatever I would do with that crossflow. That would eliminate the need for the bulb to I would think. What do you think of that??