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Ed. Note:  Wady Hamam or Pro Mod Wad as he is known in the business is NOS's main nitrous Guru. He has been involved in nitrous oxide injection almost from its inception especially with the Pro Mod division.. He is originally from the Buffalo, New York area and has been involved in all types of racing from flat track motorcycles to fuel dragsters. In his wasted youth he even raced a fuel funny car powered by a blown and injected small block Ford! He and his brother campaigned a front motored Top Fuel dragster and lost a race against Don Garlits at the now closed Niagara Falls Dragway. His advice about nitrous problems is highly sought after but he is hard to get to. He has agreed to answer one question every couple of weeks for Drag Racing Online readers. Email your questions to: promodwad@racingnetsource.com, and he will answer the question he finds most intriguing.

Dear Pro Mod Wad,

I'm preparing to build a 5-inch 706 nitrous engine to run Pro Modified. My piston maker said to max out the static compression ratio. The combo I'm looking at now has 16.54/1 C/R and a 1.398 rod ratio.

Are these figures OK in your opinion? I was also planning friction and thermal coating the pistons. Is that a worthwhile cost?

Thanks.

Rick

Rick,

The rod angle is right-on but C/R is way high! If you are planning to run multiple stages of nitrous you should have C/R in the 13.5 or 14 to 1 area. Any more than that will give you terrible detonation problems. Most of the strong-running Pro Mod racers have been up and down on ratios and all are back to the 13.5 area. You will do yourself a large favor if you stay in that range.

Hope I have helped you on this issue.

Wady Hamam
 

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