Racing the BSP at Roebling Road

Installing a BSP Restrictor Plate

Take everything off to this point.







Put on a gasket.







Put on the restrictor plate.

Put on a second gasket.

Install the carb

Install the air filter adapter.










WRONG! The air filter adapter is installed upside-down.
Notice the blocked air orifice.

Splined Post for Jr. Dragster Torque-Converters

For several years, ARC has been making billet crankshafts with splined PTO shafts to provide the added strength some of today's larger, more powerful cars require, but the availability of posts for various clutch assemblies has been limited. So we decided to make our own.

The main post is made of 7075 T6 Billet Aluminum. The replaceable collar is made of steel and is assembled to the post via piloted LEFT-HAND threads so the direction of resistence from the engine to the belt keeps the collar tight. Posts and collars will be available soon for ALL the major Torque-Converters used today.

ARC "Ported" Clone Air Filter Adapter

Installed Correctly (click on picture for larger view)
Installed Upside-Down (click on picture for larger view)



For maximum performance, ARC's air filter adapter is ported to the low speed (left) and high speed (right) orifice jets. This is necessary because the funneled velocity stack design would otherwise cover these jets. Improper installation of the air filter adapter will partially cover, and impede flow to the orifice jets because they are not in the same position. The engine will spit and sputter and lack both bottom, and top end power if these orifice jets are blocked.

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.