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" It seams that no matter how big a 4 stroke engine I use, It seams like it just cant keep up with a two stroke that's half the weight and twice the power.... "
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How big a four stroke are you using.....?....

The 1.20 Pumped OS, and even the 1.20 Magnums pull about
the same size props, and at the same RPM as the 1.08 and
1.20 "tractor motor" two strokes. ( the 10K range).

The little .52's, .53's, and .60 four strokes don't make much
power....that's for sure....but up in the 20cc range....

....they're Brutes.....especially if you put the nitro to them.

did YS stop making the .91? on their website they have their .63, then the 1.10. At central hobbies, they say," OUT OF STOCK, WATCH FOR THE NEW YS110 ENGINE, COMING THIS SUMMER" But besides that stick with the O.S. or Saito. You cant really go wrong with either of them. I own two Saito 100's, which are very great and reliable engines engines. I personally think the Saitos sound and look better then the O.S., and they are slighty lighter, which could be a good or a bad thing.

Hell, I think all of this B.S. talk ran the poor guy off. Dude, to get the best answer/advice, we need to know what plane the engine is going on. Without this info we don't know what you're wanting out of the plane, speed, torque, ??? As far as being able to give advice as to which engine is best, for the money, dependability, power, weight, Saito is my pick. Sure YS seems to be the powerhouse of the 4 bangers, but I've got three friends that have owned them and they were constantly complaining about how finicky they were. They eventualy sold them and bought Saitos. I don't call spending half of the day tuning an engine fun.
This is just "my" opinion and what I've seen at "my" flying field.

John

Gentlemen:

As has been pointed out, we have been given no specification or application.

Taking advantage of that loophole, here is my candidate for the best four stroke.

Bill.

On its last overhaul, 13 years ago now, it gave 430hp on the dynamometer.

Here's the sign on the back:

And just one more, it's the AMG version, the factory hot rod.

But for model airplane four strokes, getting specific, my preference is the Saito line.

Bill.

PS: Yes, the speedo does read to 240. wr.

I have owned OS and TT four strokes. I like the TT better, more power, but they are a pain to break in and there are only two sizes.

....one of the best 4-strokes around now is the V-5 Honda
1000 cc (one liter) grand prix motorcycle racing engine....

....200 plus HP....(they won't say)....

Dave:

Bet that rice burner wont run 13 years from overhaul and still be going strong.

And if I had paid attention to the chain noise I wouldn't have broken one and had to overhaul the Mercedes when it was only ten years old.

Bill.

....bet that Mercedes won't run at 16,000 rpm, all weekend,
and go 200 mph....on one liter.....just think what a 5 liter
engine would do....

....and I'll bet that it will be a very long time.....till the
Germans will ever consider competing against the Hondas,
or the new V-4 Itailan Ducati entries....the BMW's, Mercedes,
Audi's have no vested interest.....or money to compete with
the new one liter motorcycle engines.

Dave:

My Merc was right at $40K 23 years ago this month, from the factory in Stuttgart. I think the current 500 AMG is in the $130K range, not sure.

But other than the engine job, It has given me no problem until last year, bought a new ignition distributor for it.

200 mph? Nope. But while in Germany it ran 150 with no problem. I've found the cops here in the USA usually frown fiercely when you run much over 80. And sometimes also when you aren't going anywhere nearly that fast. YOU try the school zone at 40, I wont.

Point is, while I have the capability, it is a capability that does not get used. But I like knowing it's there.

Bill.

PS: I currently have around 30 K&B 40s and 61s. wr.

Hey Will....

You gotta love the big German iron!

I love my seven series....it compares VERY favorably to 1000cc motorcycles....especially in the rain!



'Race

Race:

My pet "Bay-Em-Vay" was the 635.

And a definite agreement on the rain.

Bill.

Best 4-stroke? Dodge slant-6, no contest!

For your model planes, I like the TT 91 FS but probably will start buying Saitos in that size because of a defect and poor service.

But the best four-stroker is the Toyota 2JZGTE engine like the one in my Supra Turbo.

3 liters 320HP stock.
Easy and cheap to boost to 450HP.
With some bucks you can squeeze 1200HP out of this little 3-liter 6cyl masterpiece. Did I say 1200HP from a 3-liter engine? Yes - from www.powerhouseracing.com
The problem is getting the tires to stick.
Mine (450hp) has seen 165mph on the track a few times - ran out of room and had to hit the brakes. 200mph would be possible with enough room. And the brakes NEVER FADE. (don't forget to bleed the brakes to get all the water-soaked fluid out of the brake system before you try this at home kiddies).

Check out these videos:

http://www.mkiv.com/videoarchive/rm/powerhouse991.zip (sideways at the traps, crazy)
http://www.mkiv.com/videoarchive/rm/f40_vs_supra.zip

Good luck squeezing one of these into your model plane, though.

bgi:

Sorry, but any engine that used a rubber band to drive the cams will never be on my "Best" list.

Bill.

Ok. I'll bite. Rubber band? Heh... Well... let'e be nice.

Anyway, if you're pushing it to extreme power levels and 10K RPM's plus, you'll replace the factory timing belt with a better one.

Besides, it's a non-interference engine. So the valves don't bend if you fail to maintain the engine and it breaks. I've seen timing chains break. The geared cam in my both of TT 91 FS's smack around sometimes making an awful clank noise. So perhaps it's as much the implementation as the materials and parts selection in the design.

Perhaps this belongs in the "gas engines" section.

Well since we are getting CrAzy about it...

what I should of said.... what 4 stroke can produce the most HP and most reliable running with out a flame out....

P.S. The ford 289 /302 block was the BEST 4 stroke ever made....

My 67 cougar had over 400 HP by the time I was done tweeking it....

TN

TommyNad:

Best four stroke for a model, using power to weight as your criteriion, there is no question, as YS has all the rest beaten that way. But the YS requires a lot of maintenance, and parts are expensive.

Just for general trouble free operation with good power, get a Saito.

To fly with less capital expenditure, Magnum, Asp, or any similar.

Or if you want to pay a higher price for a Magnum, get an OS.

Bill.

PS: The Ford 289/302 is fine up to about 500hp. Over that it pulls the center main webs out of the block. The small block Chevy can run reliably at 800hp on the street. Drag tune, with the concreted block, over 2000hp. wr.

After running Saitos and TT's I say I'll spend a little extra on the Saito from now on. Chief aircraft has some good deals. www.chiefaircraft.com

I've seen people run Honda 4-bangers with the water jackets filled with metal to support the boost they were running. Gets hot quick, so it's only good for 1/4 stints. The Supra engine will put out 1200HP day in / day out on 3 liters and things in the engine don't break. That's impressive. The obvious problem then becomes the clutch and driveshaft - the tranny and rear-end can take it (also impressive). Clutches that can handle the torque are like light switches - not very streetable. So they put powerglide trannys in them. Next problem: keep the tires sticking to the pavement. Oh, well... Keep her under 7 hundred and she's more streetable. Getting sideways at 150mph is kinda scary.

cheers.

Hello. Race City I am new again and this thread came up first and is quite helpful to me ...the happy learner. Your comments remind me of the cast member at Disney that snaps off at a first time guest that asks where the bathrooms are because HE as already answered that a thousand times. Well there are many thousands of hobbiests that ask , yes, silly or previous answered questions however they are our fellow friends here welcome and all. Yes this is a Ford or Chevy question ...but it is always fun and fresh to get new threads. Take care and I truely intend no hard feelings.

LOL I like the car motors ...IT does give the perspective of no real answer is the best.

I'll bite, why do you like the Saito better, weight, power, quality?

Saito for all three reasons.

Hobbsy,
Asking BGI who in the past has had positive comments on the TT and has also owned Saito. It is obvious you will not bother with a TT, which I don't understand since you seem to agree with me about Fox and other brands.