New and improved GX 340/390 flywheels

The GX 340/390 engine has grown in popularity to the point that we were able to produce a more specific flywheel body to this engine. One major change is that these flywheels are designed to use the stock coil, and don't require any coil bracket. Both flywheels are SFI certified and have integral billet cooling fins.

We have two new models and they will replace our previous models.

First, the 6623. This flywheel is basically a billet replacement for the stock flywheel and plastic fins. The keyway is in the stock position and it is designed to use the stock pull starter. $195.00

The 6622 also has ARC's steel adjustable timing hub and a bolted-on ring gear made of super strong 7075 billet aluminum for the on-board electric start. Some adaptation is required if you also want to be able to use the pull starter. $250.00

Cutting EL Tires

http://video.google.com/videoplay?docid=2823905883109981466&hl=en

More like grinding than cutting. I can take a new EL tire down to "low dots" in 8 minutes with this machine. I sell a new set of ground tires mounted on Douglas Q+ wheels for $380 plus shipping (and tax in GA). If you bring me your tires already mounted, I charge $20 per tire to grind them. Prepped tires CANNOT be ground. 800-521-3560

BSP Valve Springs (when to change and why...or why not)

I have about 150 new springs in stock. I have checked about 50 of them in many ways. They are all so close to one another that I quit testing. I compressed a brand new spring to its solid height and it lost tension to the point that it was no longer better than a spring with 14 races on it. I stretched a spring, and it went up in tension, but after compressing it at full cam lift, it was right back to where an untouched spring was. All the fresh springs measured 10.8 lbs at .850”. My scale is only accurate to .2 lbs, but my measurements are accurate to .001”
So here’s the kicker. If you are running the stock air box and filter and the stock muffler, heavy springs are actually bad because the engine makes more power and is faster at about 5200 RPM, which is well below the 5800-5900 RPM valve float RPM. Added tension is just a waste of energy. With the little header and muffler along with an air filter adapter and bigger jet, the power band moves up slightly in the RPM range, but still not enough to turn the engine to the point of floating valves. So basically, if the intake and exhaust is left stock, worn out springs are better, and with an aftermarket intake and exhaust you will want to freshen your springs after a few races. Changing springs is very simple and can be done with your bare hands without removing the head from the engine. I'll do a picture story on that and post it here this weekend.

Parts for the 6.5 HP OHV Engines

ARC now has inventory of new parts for the Yellow OHV 6.5 Horsepower BSP engines and the Blue 6.5 HP engines.

We also carry high performance parts for these engines including stainless valves, HP springs, billet aluminum spring retainers, billet rods, billet flywheels, cams etc.

We are fully engaged in loading all these parts onto our webstore and expect to have all out clone related parts online before the end of February.

Pulsing the Fuel Pump from the Rocker Cover

I drilled a hole to insert a 1/8" pipe nipple into the rocker cover. The hole is below the baffle plate in the rocker cover so it is pulsing directly from the rocker chamber. The red vent tube is above the baffle plate. I have raced this a couple times now and it works very well.

New Cranks...Lower Cost

Our stock-stroke and +.200 stroker flathead cranks are now made of a less expensive, hardened chromolly steel. The stock stroke crank is also used as a stroker crank in the Animal.

The new stock-stroke crank is part number 6580-C and the +.200 in part number 6584-C

The new cranks are $299.

ARC flathead billet flywheel for PVL

ARC now has a billet flywheel for the flathead that will allow you to use the new PVL ignition from B&S. We have seen substantial gains with this coil and flywheel over the standard (old) coil and ignition.

The new flywheel (#6617) weighs 3.85lbs. It has adjustable timing and is SFI certified.

Although this new flywheel has a larger diameter than a 3hp flywheel, the rim weight of the new flywheel is considerably lighter than the 3hp models. This means that acceleration with the new flywheel would be about the same as a 3hp model. BUT, the PVL ignition used by the new flywheel will give you gains beyond what you could ever get with the 3hp models with standard coils.

The reason this flywheel must have a larger diameter than a 3hp flywheel is because the PVL coil is designed for a specific diameter and appears to be sensitive to any deviation from that diameter.

Tecumseh OH Billet rod from ARC

ARC now has a stock replacement billet rod for the Tecumseh OHH 5-6HP engine.

Part #6282 3.484" (stock length). $59.95 MSRP

It does not use bearing inserts.

PVL Ignition on a 305

Hey guys, just wanted to pass along that Randy is working on coil brackets that will allow the use of the PVL coil and one of our new billet flywheels for the PVL on a 305. One of the brackets will be for a stock crank setup and the other will be for a stroker setup.

We have not tested this on the 305 yet, however, we found significant gains on 330' Outlaw Jr Dragster engines and on Animal engines over what we were able to produce with our original billet flywheels and standard coils. In order to get the greatest improvement, we had to richen up the fuel/air mixture and reduce timing from the settings normally used with the standard setup. On the Drag engine, we ended up with a longer header pipe and actually needed to put on a bigger carb because the engine wanted more fuel than the smaller carb could deliver. This testing was done at Roy Whaley's shop on one of his highest horsepower engines. The HP increase was anywhere from 1/2 to 2 HP and the fall off on top end was not as steep as with the standard coil.

ARC rod for the stock 305 crank.

P/N 6231 - 4.335" Uses the stock crank and an JE "EXF4500" piston with a .490 wrist pin.

This rod will give you the same compression height as our P/N 6235 stroker rod for the same piston does with our P/N 6585 stroker crank.