my engine mod questions

[The Product]

hey guys
i got a 6.5 clone from princess auto (power fist) and i took the governor out and i did a 6* timing advance next up is the 18 lbs. valve springs

what im wondering is, do i have to watch my revs so it doesn't blow up? ive heard the valve springs will pretty much govern it out? ive had a bad experience with this with my lawn tractor that i took the governor out. i reved it to high and the valves floated and the piston punched the valve right thru the head .

do i really need anything like higher octane?

im also lookin towards milling the head down .065". that will put the compression to 10.0:1? what octane do i use then?

thx guys

 

[mike75925]

i would say don't run it at all till you get the stiffer springs. i had one float just from removing the governor. of course, i did have lash caps on both valves.

 

[The Product]

well i have run it and it runs pretty nice the timing advance made a huge difference on throttle response for my motor

 

[mike75925]

cool. i tried tapping the key out of my 160's crank in order to grind it, but the da&& thing is just flattening out. for some weird reason, nobody around here sells honda keys. besides, i haven't upgraded any of my internals yet. i doubt i will, unless i swap in my 160's crank. my crank pin is solid, and the honda's is hollow.

 

[The Product]

aww man that sucks the lawn mower or rent all places dont sell honda keys?

 

[jr dragster T]

The timing key in the crankshaft of my clone from the factory was in there extremely tight. I filed off a hair off both sides to make it easier to remove/install plus did my 4* of advancing. Upgrading your valve springs is just going to make it worse for the stock rod.

 

[The Product]

well ill most likely install the billet rod eventually but is anything protecting me from over reving my engine?

 

[mike75925]

not really. except for lite footing her

 

[The Product]

lol yea i guess so

 

[mike75925]

the good thing on my float was, it didn't bend the valve. i inspected the valve to piston, and if i remember right, my valve went into the pistons dish. popped it right back up

 

[The Product]

haha yea i didn't get that lucky the whole head on the engine of my lawnmower caught fire, and to put it out...my friend...had to pee on it haha we were in the middle of the road wen i was racing my friend and my other friend was in the trailor of my friends tractor lol then it blew up and we had no water to put it out (i just filled my gas tank up) i HAD to put this out so i quickly asked if anyone had to pee lmao and luckily my friend that was riding trailor had to ew it smelled SO bad cuz it was burning off the muffler too

 

[mike75925]

ah, that ain't right. but then it's better than getting blown up.

 

[The Product]

trust me man it WASN'T right but i was in front of my neighbour's house that always calls the cops on me for havin loud stuff and could you imagine her if she seen me out there with a tractor with 20 foot flames? not a good scene and melted tires and everything just not worth it lol

 

[The Product]

but anyways can anyone answer my questions?