140 cross -flo.

[terry taylor]

Anyone know how to run a 140 cross-flo. 7,400-7,500 RPM. with out useing the [strangler[ v4 8 barrel carb. system thanks?-----------------------------------The set up is a viper.

[evilrude 1]

Maybe a diff. "tuner" -L-O-L-
(remember me)

[racer]

We used to run the stranglers with the standard 4 barrel intake in order to run a second class it would loose from the 8 barrel but could still get them well into the 7k range.

[terry taylor]

Does this mean you ran strangler moded power head, as opposed to production 140 v4 thanks ?

[Superstocker]

I've been running a 115/140 conversion on my viper for 2 years now and have turned it up to 7600 rpm for a while. The engine has factory porting & pistons(non-scalloped) and that was as far as I wanted to push it on a lake motor. Now besides sounding great at that rpm(nothing sounds like a v4 crossflow IMHO), I have since propped it to turn ~6700 hopeing to make it live a little longer.

There is nothing special about the engine either; 140 heads, '77 tuner, cut can, 1 5/16" carbs, boyesen, etc. The cylinder porting has not been raised but, everything has been radiused. Including the bubble-back & block where the exhaust re-enters. I have upgraded the wrist pin bearings though. A simple build on a really simple engine that runs great and makes awesome fuel mileage.

I have been thinking about building another powerhead with the 2.6 v6 mods( a la Racer) but this thing is running so well I'm undecided... Good luck with your build and if a v4 crossflow makes you smile at 6000 rpm, you should try 7600, lol!

[racer]

Upgraded rod bearings?

[Superstocker]

Sorry, my bad. Not rod bearings. I meant wrist pin bearings. I went with an "uncaged" wrist pin bearing.

[Riverman]

What do you use as a grease and/or method to assemble the needles?

[perfmarine1]

Sorry, my bad. Not rod bearings. I meant wrist pin bearings. I went with an "uncaged" wrist pin bearing.

You should have stuck with the caged version,the uncaged verson the washer breaks at hi RPM!

[JWTjr.]

You should have stuck with the caged version,the uncaged verson the washer breaks at hi RPM!

I have built many of these with the full floating wristpin bearings and have had no failures. My current 140 turns a 27" OMC cleaver at 7400 rpm with no issues. I'd be interested to see one with this condition.

John

[930turbo]

What do you use as a grease and/or method to assemble the needles?

Take a little wheel bearing grease and put it in the freezer. It thickens up long enough to provide great staying power for assembly.

[200venom]

I use vaseline petroleum jelly.

[Forkin' Crazy]

I have built many of these with the full floating wristpin bearings and have had no failures. My current 140 turns a 27" OMC cleaver at 7400 rpm with no issues. I'd be interested to see one with this condition.

John

Caged bearings are a bit lighter too aren't they? Never weighed them, just assuming. I can't see having no cages being an upgrade.

[powerabout]

hard to believe 7600 is a good rpm to run with stock ports??

[930turbo]

I'm with powerabout, there can't be too much power left at that engine speed. Mine seems to run out of steam at about 6000. I could prop it smaller but I'm certain the boat would slow down. I guess if you are drag racing and need the acceleration more than top end it is justifiable.