445 dyno

[Barry_R]

Looking at the cam I would have expected the peak RPM to be a few hundred higher.

[blykins]

Looking at the cam I would have expected the peak RPM to be a few hundred higher.

Yep, me too. 

I have a hard time keeping up with usernames in relation to real names, but that looks like a camshaft that I would have ground, my pistons, etc.  That combination here usually makes about 525 hp @ 5500-5600, with quite a bit more torque.

[mn67]

Brent

I got a lot of my parts from you (Mike in MN). It is almost a clone of your 525/588 engine in the dyno section. I am not sure why it did not hit the #'s. It runs great, makes good oil pressure etc. For whatever reason did not get the numbers. I will play with it a bit and see what I can accomplish Jay did play with timing and jetting just could not get it there. It is going into a 2700 to 2800# car so it probably will not disappoint. I am however going to finish the car, stuff it in and then just build a bigger one (it is the first of a few I want to do). Eventually will use this in another car.

Barry,
It went to 6k without drama but the HP dropped off pretty quick. I have the dyno data but not the graphs. In the end it's an excuse to pick up another set of Survival heads. 

[blykins]

What oil were you using?

[mn67]

VR1 10-30

[blykins]

Well, that takes that variable out of the question then.  I was hoping you had some hoochie-mama thick oil in there.

[mn67]

Wish it was that easy. 

[blykins]

Here's a 428 that made as much hp/tq as your 445.  Little more camshaft, but the heads would be a couple notches under your heads.

http://fepower.net/simplemachinesforum/index.php?topic=6145.msg66861#msg66861

Did you try another carburetor?

[mn67]

It did seem a bit undercarbed, we did not get a chance to try another one though.

[blykins]

We used a 2" Super Sucker on the dyno, in combination with a Quick Fuel HR-750, for my engine that you referenced. 

When he got the engine in the car, he had it chassis dyno'd and it put down 440/500 to the tires with no air cleaner. 

[Drew Pojedinec]

He contacted me recently about the carb, asking if I had an 800 or 850 dbl pumper.

I do, but my advice was to keep the carb he has and see how it drives.  This isn't a race car, this is a street car.  We can try out a larger carb later.  Realistically is he going to see 6000+rpm at 500hp in a light Maverick on the street?
He said the engine was pulling a good bit of vac at wot, I wonder if the VS was opening all the way.

He said a later build will be larger and need a big MS carb, so I'll go ahead and build one, he can always try it out on the 445.

[blykins]

He said the engine was pulling a good bit of vac at wot......

Red flag there....

[Drew Pojedinec]

Yessir, my records show 1.7inch at 5800rpms.... but he mentioned it as a weekend car for fun on the street.  I dunno about other folks here, but with a 390 stroker I can't keep my 1000lb heavier Galaxie on the road if I try WOT on the street, it's more a >6000rpm, 3/4throttle kinda ride.

I've got a 4781, no dash number, original 1970 carb with the old roller throttle I've been wanting to build just cuz I think it's cool.  When I'm done I'll offer it to him, he can try it out just for fun and maybe save it for the next racier build where it'll really shine.
It'll certainly show on the street if you pick up some power down low or not, especially in a lightweight Maverick.

I don't know the nuances of testing VS carbs on the dyno, I've just heard from you guys that they often don't like to open fully, would certainly explain it.

[blykins]

Yes and I've had QFT throttle blades hit on the plenum/carb pad on a Performer RPM intake before.  But if he used a spacer, that would eliminate that variable. 

[thatdarncat]

I stopped by FE Power this past weekend when Mike's engine was being dyno'd. I wasn't able to stay for the whole session, but I was there when Jay checked to make sure the vacuum secondaries were opening all the way after the first few easy pulls, so that wasn't an issue on the full pulls. Mike has an excellent sounding FE, I'm sure it will be fun. I know Jay's been pretty busy lately, he doesn't always see these posts right away, hopefully he comes on at some point with his thoughts. I don't remember all the details on his dyno muffler system either, although I do know his tire "sound baffle" has been disabled.

Mike, if you end up taking your car to the track next summer let me know, if I'm free I'd be happy to go and give you a hand if needed.