Anyone ever strap their cars down to both a dynojet....

[olddog]

A friend has a Ford Ranger with military duce & half axels under it and a 460 engine. Mud runner is its only use.

First engine was done by builder "A" and dynoed at ~700 Hp. When it came time to freshen the engine up, builder "B" talked him into letting him do it. Builder "B" said he could improve the porting and the cam was too much for the RPM range he was running. He let him do it. It dynoed almost 100 Hp less than the first build. He was kicking himself and sick over it. I told him to put it in a run it before he got upset because he could not trust Hp numbers from two different builders to mean the same thing. He put it in his truck and said it had way more power.

I believe that numbers do not lie, but lairs use numbers. No two dynoes are going to be exactly the same, but more than a 100 Hp. Something is fishy. Both of these builders are well known and know what they are doing.

I'm sure there are a thousand other similar tails. Difficult for anyone to be an honest advertiser in this market. I wouldn't try to think too hard about it. It will only make your head hurt.

If you want to list engine dyno and chassis dyno numbers then just state the type of dyno used and the conditions it was tested under. Even the dyno operator, if they do not object. Then the "not responsible for the accuracy of these numbers" disclaimer.