rrr1313

Well i purchased a baja 226 from a friend with a bad motor with 1 hour .so sad! ...the setup contained a eagle crank h beams and mahle pistons .060 over . The old owner had it built by some random mechanic which installed and folded the rings cause damage to the newly bored cylinder walls and damaging 2 pistons. The current setup was a 496. But now I have to bore over .70 and it will be raised to 498? My question after checking compression it would bring me up to 11.5 due to the L92 Heads with 100cc combustion. will it be safe or should i change the heads to lower compression. Also not sure what cam is in there but I will ask machine guy to tell me. I ordered the pistons already any suggestions to make this thing not blow? thanks

Wally

iTrader: (1)

wont be safe unless you have top notch premium or race gas avail for use. First time you have to fill up on water and they only have 87/89 avail you will have problems

rrr1313

well since this boat is mostly for fun. I planned on putting premium gas before heading out or even avgas but ..I rather build it safe... I was thinking of having timing a bit retarded to avoid detenation...another set of heads is going to set me back..lol

endeavour32

iTrader: (4)

Think twice before building something thats going to require expensive gas. Boats suck lots of gas and having to fill up with $7.00 a gallon fuel would end the fun in a hurry! In addition boring your block to .7 IMO is not a good idea. I think I would sleeve the two bad cylinders instead or find a new block.

Dennis Moore

About the only thing you can do now is install a camshaft that closes the intake valves very late. A long duration camshaft with a wide LSA and installed with zero advance on the intake lobe centerline. This will knock down cranking compression (running compression) to a point where you can use pump gas.

I would suggest a single pattern camshaft with 242 degrees intake and exhaust duration.
A LSA of 114-116 degrees and ground with split overlap (no advance on the intake lobe centerline).

Combined with your high static compression ratio this camshaft might work pretty good...ya never know!

Dennis Moore

The L-29 heads have an excellent heart-shaped combustion chamber and work very well with higher compression ratios as long as they have a tight quench.
Make sure the pistons come to the top of the cylinders, even with the deck. Ideally you want aproximately .040 inches between the flat of the piston and the flat of the cylinder head. Most head gaskets are around .040 inches thick.

Bring in the ignition advance very slowly with a maximum of 28 degrees total advance at 3500 rpm.

To keep the engine from detonating, make every attempt to run the engine very cool with a 140 degree thermostat. Keep the fuel and carburetor very cool also. Cool fresh air entering the carburetor will help a great deal.
Good Luck
Dennis Moore

rrr1313

I was reading about that. I will look it up any idea where i can order sux a cam?

Dennis Moore

Any of the camshaft manufacturers will sell you this camshaft. Call Comp Cams tech line.

rrr1313

ill be using a cometic head gasket but also unsure of which one i know they are all .51 thick . so many things plus I am justa newb with a limited budget so trying to get it right before I am like the guy who sold it to me..lol

rrr1313

called the comp cam line and they suggested between 112-113 lobe seperation. 218/224 ..no matter what would need high octane. part number XR270HR-13