im new! summer project and first chopper build!!

[DCC!]

ok so i got the sprocket in the mail

and got in on the wheel and had to cut off alll the finder mounts to fit (haha good thing it didnt have fenders huh?)

started the engine and it almost killed the bike it vibrated so much so i put some rubber under both mounts and it sovled that prob easy!

thats the chain guard that came off the tiller im cutting and bending to fit right and better what yall think? it looks kinds bulky dont it?

 

[anderkart]

I was thinking that guard might look better with that lower rear corner cut off.

 

[DCC!]

again thats what i did well most of it i cut it so its equal along with the frame and then got bored with it(i have ADD bad haha so i skip around on stuff alot!)

anyway im putting the chain and stuff on tonight bc its already to drake to drive it so tomaro morn should be first test drive!

 

[anderkart]

If you dont end up using that shroud you should probably have some sort of chain guard on there just in case... My local metal supply always has a bunch of diferent styles of shorter length aluminum scraps they accumulate and sell off prety cheap by the pound. I made this (bolted together) chain guard for around $5: (that pipe and its suport braket is also aluminum, It simply hose-clamps over my origanal head pipe and only cost me a couple bucks to build)

 

[jr dragster T]

Hey, Dont use rubber dampers under your engine. A solidly mounted engine will rev higher and be more stable. Be a man. If it vibrates excesivly you may have a balance probelem with the engine.

 

[napalmfire]

cool tip! thanks! I have rubber dampeners on mine right now. I'll remove em.

 

[DCC!]

Hey, Dont use rubber dampers under your engine. A solidly mounted engine will rev higher and be more stable. Be a man. If it vibrates excesivly you may have a balance probelem with the engine.

how does it rev higher from it? and no it shouldnt have a balance problem it a brand new engine

and i also have steel bushings inside if the rubber would that make a difference?
sorry i ask a lot of ?s haha

 

[DCC!]

If you dont end up using that shroud you should probably have some sort of chain guard on there just in case... My local metal supply always has a bunch of diferent styles of shorter length aluminum scraps they accumulate and sell off prety cheap by the pound. I made this (bolted together) chain guard for around $5: (that pipe and its suport braket is also aluminum, It simply hose-clamps over my origanal head pipe and only cost me a couple bucks to build)

yeah im most likly do somthing easy bc its almost time for a test ride

i have some steel thats really close to that its the kind with all the holes in it i plan on just makinf it with that in a few mins to save my leg if it breaks. haha

 

[brendonv]

Hey, Dont use rubber dampers under your engine. A solidly mounted engine will rev higher and be more stable. Be a man. If it vibrates excesivly you may have a balance probelem with the engine.

Do you no that for a fact or have u been told? They use hards blocks of rubber on a lot of big engine mounts, i dont think it will make the engine rev less. This is hard rubber where talking about not soft stuff so the engine wont move, the rubber will just "soak" up the vibrations.

 

[DCC!]

Do you no that for a fact or have u been told? They use hards blocks of rubber on a lot of big engine mounts, i dont think it will make the engine rev less. This is hard rubber where talking about not soft stuff so the engine wont move, the rubber will just "soak" up the vibrations.

yeah i replaced the factory rubber engine mounts for polyU mounts when we rebuild my firebirds engine.

i think solid mounts just keep it stiffer in the frame...plus they just feel **** good when ur sittin behhind a 500 hp blown sbc!! :rolleyes3:

 

[jr dragster T]

I know for a fact a solidly mounted engine will rev higher. If its solidly mounted the engine is not aloud to waste energy by shaking. Get your ps3/Xbox controller that has the vibrater in it. Hold the controller loosly and tightly and listen to the RPM difference. And just because the engine is new doesnt mean it cant have factory deffects. Its a $100 chinese engine, Who knows what could have passed "Quality Control".

 

[DCC!]

yeah that makes sence...

but like you said its a $100 chinese engine spinning at under 4000 rpm and im not trying to pull every lil bit of power out of it

 

[brendonv]

a 'hard mounted' engine still vibrates and looses energy through the frame. All the hard rubber does is soaks it up making less vibrations. The engine isnt allowed to move wen rubber is under it since its very hard. Ur controller however is loose so it may rev slower. Holding it tight is like the rubber mounts or worse as ur hands are softer and soak up the vibrations. Also u cant tell me u base ur principle on a fricken ps2 controller. They are not the same.

 

[Kaptain Krunch]

a 'hard mounted' engine still vibrates and looses energy through the frame. All the hard rubber does is soaks it up making less vibrations. The engine isnt allowed to move wen rubber is under it since its very hard. Ur controller however is loose so it may rev slower. Holding it tight is like the rubber mounts or worse as ur hands are softer and soak up the vibrations. Also u cant tell me u base ur principle on a fricken ps2 controller. They are not the same.

A solidly mounted engine will rev higher, it may still shake the frame, but the frame is much more solid than the rubber, i dont care how hard the rubber is, and if your using solid plastic, then thats pretty much the same as mounting it directly on the frame. Theres no arguing on this one, however in small scale (go kart) the difference between hard mounted and dampened wont be very noticeable.

 

[anderkart]

Wow, I've never considered this whole solid vs rubber mounting concept... Interesting.

 

[jr dragster T]

a 'hard mounted' engine still vibrates and looses energy through the frame. All the hard rubber does is soaks it up making less vibrations. The engine isnt allowed to move wen rubber is under it since its very hard. Ur controller however is loose so it may rev slower. Holding it tight is like the rubber mounts or worse as ur hands are softer and soak up the vibrations. Also u cant tell me u base ur principle on a fricken ps2 controller. They are not the same.

I would use more complex principles about this subject but people unwilling to learn like you might not understand. And yes it is quite similar. The shakers in the controllers use a half moon like peice of metel off balance to shake. Trust me, If it was better to use dampers under a single cyl industrial engine I'm pretty sure we would use them on my car.

 

[DCC!]

I would use more complex principles about this subject but people unwilling to learn like you might not understand. And yes it is quite similar. The shakers in the controllers use a half moon like peice of metel off balance to shake. Trust me, If it was better to use dampers under a single cyl industrial engine I'm pretty sure we would use them on my car.

I wana hear some of those more complex principles?
this is getting intresting....

 

[jr dragster T]

Not even going to start. Wikipedia "Engine balance" Lol if you dont want to take my advice on the engine dampeners you dont have too. Its your build, build it how you wish. I was just trying to help.

 

[DCC!]

thanks for the help though

and why wont u get into it?
you already sparked my intrest lol

 

[brendonv]

You should make a thread on this "Rubber vs hard mounted" and state the principles. Hey im not trying to pay you out or anything its just i can really see how it would make much difference. I mean yer it may rev higher but how much higher. High enough to gain anymore speed? High enough to gain more acceleration? Is this change in rpm noticeable? I think it would be good to go into depth on these questions so others can learn as well.