Predator 212 cam

[Ats3196]

Can I do a can upgrade if I upgrade the springs and rod. But leave stock flywheel for time being ? What cam do you guys reccomend ?

 

[leesiel]

If you search dyno cams or other camshaft dealers ,check the details for rpm range that is desired for you application, and I'm fairly sure you can find one to stay within safe range of the flywheel; but it is always best to upgrade flywheel .
If I'm wrong someone please correct me.

 

[Poboy kartman]

Yeah...no problem...(except for one)....(which I'll get to in a minute) ....

Yeah...HERE'S THE DEAL....we get a few mealy mouths spouting off about "exploding" flywheels....but NEVER a pic of one!!!! NEVER!!!!

The stock flywheel has a plastic fan...which STILL is capable of a LOT of rpms and isn't gonna do alot should it turn loose.

But....tons of guys mod the BEGABBERS outta these engines with the stock flywheels and offset keys.

Now...here comes the problem.....didn't you ALREADY ASK THIS?

Please don't start more threads for the same question....

 

[Ats3196]

Sorry.. Didn't thin I saw same question in other thread . Really what I'm wondering is, is there going to be any benefits or disadvantages if I add 18lb springs and billet rod ? Is that worth it ? Do I have to change anything else? Otherwise I'm going to leave stock springs and rod in .

---------- Post added at 10:57 PM ---------- Previous post was at 10:48 PM ----------

Also...am I able to use the 8 degree timing key without other upgrades ..? I'm sorry, I'm
Just confused on what I can and can't use from
This kit I bought.. Was told I can't use springs without upgrading rod.. Do I need to upgrade anything else ? Is it even worth it ? Wb the timing key. Can I use the 8 degree key with the rest stock or no? So all I'm asking is what exactly needs done to be able to use my 18lb springs and advance the time 8 degrees.... And is it even worth it if I'm
Going to stop there ... thank you

 

[Poboy kartman]

It ALL needs to work together. You can search this forum and Google and get an idea of what to do....BUT...

It's a little bit like you have five cards in your hand....and you want us to read you the rules of poker according to Hoyle....

We ARE NOT going to go through the thousands of combinations that make up a MODIFIED engine.....

And most of all....only ask the same question once.

What about the timing key? WHAT KIT? (Did you forget to mention that????????)

We'll help you...but...WTF? You're all over the place and I already explained half of this to you....

I've explained more than you've divulged as to what you are doing.

Go back and read your other thread!!!!!

 

[chancer]

Give this a read:
http://www.diygokarts.com/vb/showthread.php?t=32385

It is a current engine build, "He Goes All Bob". I mean he hits every possible detail and question. Lots of links and Videos. He is just learning too.
There is also alot of fun BS thrown in there. and don't expect to get to a point.
The point is there is the most info you could want in one place. Even his mistakes and learning currrve.

 

[ezcome-ezgo]

Why don't people just buy an engine, put it on a kart and go anymore?

 

[landuse]

Why don't people just buy an engine, put it on a kart and go anymore?

That's what i want to know too. Most of the time people try mod the engine and then get eternal hassles with it afterwards

 

[757 Karts (Deathwish)]

yes you can put a (slightly bigger) cam in with the stock flywheel and timing key but i recommend the mod 2 cam with the 18 lbs springs BUT... you might then have an issue with your fuel and air ratio! I put in the Mod 2 cam with a Holy Moses carburetor and it wanted air!!! like no air filter, but like i said the only issue i see is air/fuel ratio

 

[Poboy kartman]

Deathwish: What's your opinion on when a billet flywheel becomes necessary and when a stock one becomes iffy?

Obviously, you are around guys pushing these things.

 

[757 Karts (Deathwish)]

I took the cheap route and cut every other blade off if the stock flywheel and filed it down til smooth yes its timely but still holding up on my kart some guys I race with have used the billot flywheel with a 8 degree key and sheer the keys daily as for when it should be put in / modify the stock one if you get a cam that's going to push more then 5500 rpms the mod 2 pushes about 7000 hope I awnsered your question clearly

---------- Post added at 03:03 PM ---------- Previous post was at 02:53 PM ----------

Can I do a can upgrade if I upgrade the springs and rod. But leave stock flywheel for time being ? What cam do you guys reccomend ?

Is it the hemi?
If so do not go bigger then the Mod 2 without conectng rods
But you are going the right route for speed and tourqe if you keep close to 6:1 gear ratio

 

[PGBAJ]

What I have had experience with is over 6000 rpms the billet flywheel is "needed" just for safety. Expect when you get to that point and install the billet flywheel to go backwards and have to redo a bunch of setting. It will slow down your kart a lot out of the hole and in acceleration out of turns due to the lighter weight you have less centrifugal forces taking place in the engine. Some of the guys here play on the unsafe side and go back to the standard flywheel when running 7000 to 7500 rpms but not me and that's when they start shearing timing keys.

 

[Poboy kartman]

What I have had experience with is over 6000 rpms the billet flywheel is "needed" just for safety. Expect when you get to that point and install the billet flywheel to go backwards and have to redo a bunch of setting. It will slow down your kart a lot out of the hole and in acceleration out of turns due to the lighter weight you have less centrifugal forces taking place in the engine. Some of the guys here play on the unsafe side and go back to the standard flywheel when running 7000 to 7500 rpms but not me and that's when they start shearing timing keys.

And they are shearing keys because they're running offset keys, right? My point is...there are people that come on here all the time and say that you should get a billet flywheel as soon as you remove the govenor!

I wonder why those guys shearing keys don't get smart and lap their flywheels in?

 

[bob58o]

But....tons of guys mod the BEGABBERS outta these engines with the stock flywheels and offset keys.

Cannot spell beGABbers in this context without ME!

---------- Post added at 03:41 PM ---------- Previous post was at 03:26 PM ----------

Give this a read:
http://www.diygokarts.com/vb/showthread.php?t=32385

It is a current engine build, "He Goes All Bob". I mean he hits every possible detail and question. Lots of links and Videos. He is just learning too.
There is also alot of fun BS thrown in there. and don't expect to get to a point.
The point is there is the most info you could want in one place. Even his mistakes and learning currrve.

What I have learned so far, is that many things go into a perfectly tuned engine. Also engines are tuned for a purpose.

1/4 mile?
Street Engine?

Gearing, Tire Size, Carburetor, Jetting, Camshaft Lift, Camshaft Duration, Camshaft Intake Valve Closing Timing, Compression, Intake and Exhaust Flow Rate, Valve Size, Octane Rating, and a number of other things all go into a perfectly tuned engine.

I've also learned that flow testing equipment and dyno testing is required to get it perfect.

Best most of us can do is get better. I'm trying, based off others previous work, some independant research, and a lot of help from here to get more than 15 HP and around 6000 RPM max.

I've probably done enough research on my kart engine to try to build a high performance V-8? LOL

 

[Poboy kartman]

A better high performance V-8 than most I'd bet....You'd have to go old school, tho.

It couldn't be fool injection....HAVE to be naturally aspergerated....but by the time you got done GAB .....WAIT....WHAT DONE?

 

[757 Karts (Deathwish)]

there are people that come on here all the time and say that you should get a billet flywheel as soon as you remove the govener

I understand why some people say that but not everyone has money they can throw around here are some cheap ways of advancing timing (adjusting the coil and/or grinding the stock key) along with the flywheel by shaving down every other blade ( like I've said in a previous post) I can honestly say I have yet to screw my motor up with the way my kart is set up with grinding the stock key and shaving flywheel

 

[Poboy kartman]

Do you know anybody who has lapped their flywheel and run without a key?

 

[757 Karts (Deathwish)]

Yes I have, works as well but the grit paste ( what ever its called ) is dificult to find at the local automotive/hardware stores in my area most of them have to special order and I personally don't like to wait lol

 

[Poboy kartman]

Yes I have, works as well but the grit paste ( what ever its called ) is dificult to find at the local automotive/hardware stores in my area most of them have to special order and I personally don't like to wait lol

Weird...it's on the shelf at O'Reilly here with the silicone and Permatex...ask someone who works there for valve grinding compound....I think you'll find it's actually VERY easy to find.

 

[757 Karts (Deathwish)]

I may be wrong but I haven't lapped my flywheel so I haven't had to ask, just by what I was told from the guys that I race with its near impossible to find