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

[Cashburn]

If you don't know that some Mustang dynos are actually inertia dynos just like Dynojets it's going to be even tougher to draw those comparisons...

But I suppose you are correct, if you are selling just the engine and ignoring its final use/application then just demonstrating its peak numbers without any of the actual final bolt ons is a better marketing tool?

Or if the numbers are strong then why not? A big part of each story is what it went in and where. There's a builder online that sells a sh!t ton of "engines" but I strongly feel that most of them never even get into the cars or the cars never get finished so all the "satisfied customers" really have nothing to go on.

[blykins]

If all numbers are not relative to each other, then how is it a marketing tool?

If I build an engine and it makes x horsepower here, y on a Dynojet in the car, and z on a Mustang in the car, then what is the standard, and who's to say that the engine dyno is just a marketing tool?

Turning the accessories actually takes a negligible amount of horsepower. Between the water pump and alternator, we have measured about 8 hp loss.

Of course we can't mount sidepipes on the dyno, and I send out a lot of engines where the customer doesn't have an idea on how much hood clearance he will have, so it's really pointless to mount an air cleaner. Do you lose hp to an air cleaner? Sometimes. Sometimes you don't. We actually have an air cleaner here that straightens the airflow out and will net a hp/torque increase.

The best I can do is get the A/F ratio as close as I can, get the water temp and oil temp as close as I can and make a pull on it.

[joyridin']

Originally Posted by Cashburn

If you don't know that some Mustang dynos are actually inertia dynos just like Dynojets it's going to be even tougher to draw those comparisons...

But I suppose you are correct, if you are selling just the engine and ignoring its final use/application then just demonstrating its peak numbers without any of the actual final bolt ons is a better marketing tool?

Or if the numbers are strong then why not? A big part of each story is what it went in and where. There's a builder online that sells a sh!t ton of "engines" but I strongly feel that most of them never even get into the cars or the cars never get finished so all the "satisfied customers" really have nothing to go on.

I do not believe it is a marketing tool. It is the best way to measure the numbers between engines, and possibly builders.

So what if it puts out 550 RWHP? In a 10k pound truck, this may not mean squat. In a 1800 pound stripped out Opel GT, it could mean 10 second quarters.

The questions most people should be asking are; Is he reputable? Yes. Are the engines durable? Yes. Does it meet YOUR HP requirements? Yes. Does it have decent torque across YOUR operating range? Yes. Does it have a reasonable price? Yes. Then buy it.

[blykins]

Originally Posted by joyridin'

I do not believe it is a marketing tool. It is the best way to measure the numbers between engines, and possibly builders.

So what if it puts out 550 RWHP? In a 10k pound truck, this may not mean squat. In a 1800 pound stripped out Opel GT, it could mean 10 second quarters.

The questions most people should be asking are; Is he reputable? Yes. Are the engines durable? Yes. Does it meet YOUR HP requirements? Yes. Does it have decent torque across YOUR operating range? Yes. Does it have a reasonable price? Yes. Then buy it.

That's kind of the underlying point here...

If it does put out 550 rwhp on one dyno, and you run down the road and put it on another brand and it only makes 500, which one is right?

That leads to discussions that involve, "That particular engine builder is apparently fluffing his numbers because it only made x horsepower on our dyno."

[itstock]

Originally Posted by blykins

That's kind of the underlying point here...

If it does put out 550 rwhp on one dyno, and you run down the road and put it on another brand and it only makes 500, which one is right?

That leads to discussions that involve, "That particular engine builder is apparently fluffing his numbers because it only made x horsepower on our dyno."

Given a certain DA and corrected dyno numbers, it would be the rwhp figure that most closely resembles a trap speed. Of course then you have to figure in driver error and what not, but it is at least more of a direct comparison.

[Cashburn]

Originally Posted by joyridin'

I do not believe it is a marketing tool. It is the best way to measure the numbers between engines, and possibly builders.

So what if it puts out 550 RWHP? In a 10k pound truck, this may not mean squat. In a 1800 pound stripped out Opel GT, it could mean 10 second quarters.

The questions most people should be asking are; Is he reputable? Yes. Are the engines durable? Yes. Does it meet YOUR HP requirements? Yes. Does it have decent torque across YOUR operating range? Yes. Does it have a reasonable price? Yes. Then buy it.

Do you mean that without the curve/graph and some detail on the vehicle it went into (and you are adding the price they paid) the info is meaningless? Probably not. Your not going to get a fair durability listing, but the other details could be shared. That's where marketing comes in and answers those questions without asking them individually.

Ultimately if it is a drag engine then I'd want to know what it did and inside of what. If it's a street engine I'd like to see the curve and how it will act in the lower rpms, but at the same time what it does up top. The more you can tell me about the ultimate performance of the engine the better... a lot of shops just don't do that in a clear manner. I mean .750 is great on the heads, does the cam even go there? I don't know, I just want to drive the bastid, how will it drive?