Posted by Kevin Williams on 1st Jan 2015
Cylinder Leak Down Testers work by adding compressed air to a cylinder though the spark plug hole and measuring how much pressure is lost and where that air is leaking to. This can be very beneficial in determining overall engine health or where a potential problem may be.
A solid engine will have less than 5% engine leak down an any cylinder, but generally anything less than 10% is acceptable. If you have 10% or more, you'll want to listen or feel for air coming from the intake, exhaust or crankcase breather. This can pinpoint a problem to the intake valve, exhaust valve or piston rings respectfully. If you pinpoint the leakage, double check the seal on the spark plug hole. Another possibility is a head gasket and the leaking air going into a cylinder next to the one you are testing.
Lead Down Testing is best performed on a warm engine and should be done at least once a year.
The first tool many DIY mechanics grab when engine performance seems to suffer is a compression tester. While the compression tester serves it's purpose of determining what cylinder may be damaged, it will never pinpoint the actual problem. A bent valve, damaged piston, head gasket or warn piston rings can all contribute to a low compression [...]
We offer ECU Reflashing for a number of sportbikes to eliminate speed limiters, sluggish acceleration and peak power reduction. We've gotten some question about this that we'd like to answer. Q - Will have need to have my bike re-tuned? A - No. As we make adjustments to the ignition tables and secondary buttery tables we also adjust [...]
Most of us don't think about our battery when we put the bike up in storage. It's important to remember a few key things that will help to save some time and money when you get the bike back out.1 - Remove the battery from the motorcycle. This is help to prevent any discharge from [...]
Weather is changing, and temperatures are dropping. If you're getting ready to store a motorcycle in a shed or garage that isn't heated, but sure to check your anti-freeze, or drain the water out if it's a race only application. You can also check the ethylene glycol or propylene glycol amounts with an anti-freeze tester [...]
When using the timer output on any "Schnitz" Box (PNC-3000, Micro Storm or Firestorm) the output is rated at 2 amp max. This means that if you are connecting this to anything that will have a draw on it, a relay must be used. This would include a solenoid of any type.
Extend the life of your chain and sprockets by removing encrusted deposits of grease, sand and dirt.Thoroughly clean the chain with a non aggressive solvent, such as Motul Chain Clean/Degreaser. Using gasoline or harsh chemicals can cause damage to the O-rings.Lubricate the chain with a high quality chain lube. It must be fluid enough to get between the chain rollers [...]
Kevin Williams has been working for Schnitz Racing for over 11 years now and has been around motorcycles and dragracing for longer than we can remember. His weekly tips will help out novice riders and even those of us that think we know what we're doing. Look for them every week, here on our blog.
Ryan Schnitz on the HTP Performance Suzuki Hayabusa Nitrous Pro Street Motorcycle
The Starting Line is a biweekly column for our Sportsman drag racers brought to you by Schnitz Racing. Every other week we will feature a frequently asked question and have it answered by a panel of experienced sportsman racers, led by Ben Knight. Having questions answered by multiple racers will give our new racers several [...]