Engine decision?

[Klay]

I'm trying to decide between these two...

http://cgi.ebay.com/DuroMax-XP65HPE...610?pt=LH_DefaultDomain_0&hash=item2eb113aa3a


http://cgi.ebay.com/6-5-hp-engine-E...040?pt=LH_DefaultDomain_0&hash=item4aa3f4b058

Anyone have any experience with either. Looks like for $5 more after shipping I would get .5hp and slightly more displacement going with the DuroMax. The only thing I can find is with both, it looks like something will have to be fabricated for the throttle but nothing too terrible.

 

[redsox985]

Don't pay that much for the 6.5hp motor, you can get it for $100 new.

 

[slideways]

I don't think you can get an electric start one new for that price. Myself i'd get the 6.5 just because you wont feel the extra .5 hp. The extra money could be spend right away on an intake and header which will put you at around 8hp anyway without the governor.

Do you need electric start?

 

[Klay]

Yes it has to be electric start. The extra 1.3 ft lbs of torque is what had me thinking it might be worth 5 bucks. I was just really curious if one was better quality LIFAN or DuroMax. Even though the same company probably makes them both using the same parts.

 

[r97]

i don't quite see the need for e-start, but thats your call, it cost 34 to ship the 6.5 which cost about 160, so lets just say 195 total?, then the other is 7 horses with free ship. me personally i would get the 7 horse, even if you can't tell, 7hp vs 6.5hp? 7hp sounds better, . you could put in your "best offer" so the 6.5 is a bit cheaper, but i would still get the 7

 

[slideways]

That's true. i didnt really look at the difference in price. The Duromax is a neat looking motor too. I just noticed that the 7hp is a 208cc. I believe the difference is in the head. Ultimately at this point you decide if you want a torquey motor or something with top end. The lower displacement has a smaller head which is better for torque and most will even put a smaller one on. The bigger head is usually a little better if you are looking for flow which is better in the top end.

 

[r97]

hay, more torque, same hp = cost savings for sprockets + making it so your less likely to bottom out + potentially eliminating the need for a js.

 

[Doc Sprocket]

Personally, the only reason I'd want electric start is for the charging circuit. Otherwise it's just extra weight, between the starter and battery. A well-tuned engine should be a sweetheart to pull-start...

At any rate, back to the topic. If you like the bigger engine, go for it. I would prefer the higher torque. Besides- that 6.5 looks like one of the cheesier clones to me.

 

[devino246]

Besides- that 6.5 looks like one of the cheesier clones to me.

Yep. Specs sound sorta strange too. 196ml?

 

[Doc Sprocket]

Ha! Sorry- I just noticed the sig line I added goes well with yours!
Incidentally, while measuring the displacement in millilitres is bloody strange, it is technically accurate... 1cc=1ml.

 

[r97]

yea, my engine, start first pull every time, you pull 6" of cord and you feel the clutch release because the engine has already started!

 

[devino246]

Incidentally, while measuring the displacement in millilitres is bloody strange, it is technically accurate... 1cc=1ml.

Wow, now I feel like a hypocrite. I didn't know that

 

[r97]

i think he is putting this engine in a body, so it could be somewhat of a pain, but with my 7th grader income, its not a 100 dollar problem. if its going in that body make sure its vented and has heat shields.

 

[Klay]

The electric start is because it's going under a fiberglass 1/2 scale 65 Shelby Cobra body and I don't want to cut the body up to give me access to the pull start. My biggest concern was if anyone had any good or bad info on either of the two engine mfg.

 

[r97]

they are both clones, i don't think duro max makes anything other than industrial style engines, lifen makes industrial and atv style engines.

 

[Doc Sprocket]

The electric start is because it's going under a fiberglass 1/2 scale 65 Shelby Cobra body and I don't want to cut the body up to give me access to the pull start. My biggest concern was if anyone had any good or bad info on either of the two engine mfg.

Ahh, okay. That makes perfect sense! I can't blame you on that one. Do the overall dimensions of both engines fit within your criteria? I'm sorry that I'm unfamiliar with either engine, but I'm going to stick to my previous comment about that 6.5 not looking like one of the better ones.

Isn't it sacrilegious to put an import powerplant in a Cobra?

 

[modelengineer]

I think you should go for a v-twin motorbike engine. At least then you could have a lumpy idle, a bit more V8 sounding than a clone. It wouldn't have to be big, you can get a 250 v-twin to idle like that with a bit of fiddling. It has the advantage that you get a proper clutch and gearbox. You could also route the exhaust from each cylinder out opposite sides through the side pipes.

 

[Doc Sprocket]

I think you should go for a v-twin motorbike engine. At least then you could have a lumpy idle, a bit more V8 sounding than a clone. It wouldn't have to be big, you can get a 250 v-twin to idle like that with a bit of fiddling. It has the advantage that you get a proper clutch and gearbox. You could also route the exhaust from each cylinder out opposite sides through the side pipes.

Oh, wouldn't that be beautiful! My Yamaha VX250 Virago engine would be perfect! Maybe see if you can find something? A busted-up bike could likely be had for the prices of those clones!

 

[redsox985]

I second the movement to get a kick arse engine! A nice big rumbling motor would be amazing. Don't scale the sound down by half. How about 1/2 scale power? That would be crazy!

 

[devino246]

I second the movement to get a kick arse engine! A nice big rumbling motor would be amazing. Don't scale the sound down by half. How about 1/2 scale power? That would be crazy!

V4. That would be beyond crazy.