Dollatee123
New member
Anyone can help me out?
Rod bearing too crank journal Clearance ?125 is too small bogs on top end like the 135 130 seems to be the sweet spot right now with no bogging but it can barley go past 6800rpm under load. And my rod clearance is fine doesn’t hit anywhere. I’m just mind boggled trying to figure out why it hits a wall at 7k
If it sounds like its hitin a rev limiter .Hey I have a predator that’s fully decked but it only has one issue. I have 32-28 valves ported and polished 14cc chamber with a 26mm mikuni and 36lb springs with all billet parts flywheel side cover valve cover flattop piston and a .308 grind cam with champion rocker arms fully vented with oil catch can but it only hits 7500rpm no load and sounds like it’s hitting a rev limiter and is just maxing out won’t go higher it’s build to go 10k only thing that is stock on this is the spark coil which I heard some of them have rev limiters
I’m confused on what you mean by check the coil with a feeler gage, where am I supposed to measure. I put my valve on max lift and my spring still has a lot more room till coil bind.Are you actually checking any of things suggested with a feeler gage? A lot of guys are trying to help but for example you said "it looks like you have space in the springs" or "coil looks good and is not hitting". All these things need to be to spec. A gap of .010 on the coil can have a large affect on performance.
Like install height? Maybe my install height is too low and makes me 32mm valve float early, I ordered 40lb duel springs I’m gonna see if that helps the heavy valvesHow about the retainer too the valve guide ?
What was it ?And my rod clearances I already did when I assembled the engine bro
The gap between coil and flywheel. On a factory predator the coil gap will be much less than one that is modified. I believe you should be running somewhere close to .050.I’m confused on what you mean by check the coil with a feeler gage, where am I supposed to measure. I put my valve on max lift and my spring still has a lot more room till coil bind.
The flywheel key? It’s the stock one I have a 8 degree one that I can throw in to tryHe never has said what the ignition timing is set at.
How do I measure pistion to valve and pistion to headThe gap between coil and flywheel. On a factory predator the coil gap will be much less than one that is modified. I believe you should be running somewhere close to .050.
.055 gap on coil not .035
.080 piston to valve
.030 piston to head
Do that.The flywheel key? It’s the stock one I have a 8 degree one that I can throw in to try
Piston to head is measured with head off. You measure how much the piston is “in the hole” at top dead center then add thickness of head gasket.How do I measure pistion to valve and pistion to head