408 dyno test

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PRH said:
I thought the cam was:

Summit Racing SUM-1789 Summit Racing™ Camshafts | Summit Racing

TQ numbers look really strong right at the start at a pretty low rpm.
Click to expand...

Cam specs from Summit:

Basic Operating RPM Range:
1,500-5,200
Intake Duration at 050 inch Lift:
216
Exhaust Duration at 050 inch Lift:
216
Duration at 050 inch Lift:
216 int./216 exh.
Advertised Intake Duration:
272
Advertised Exhaust Duration:
272
Advertised Duration:
272 int./272 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.454 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.454 in.
Valve Lift with Factory Rocker Arm Ratio:
0.454 int./0.454 exh.
Lobe Separation (degrees):
110
 
92b said:
Dynoed this 408 today. Young guy's first build.
440.3 TQ @ 3500
323.1 HP @ 4300
Corrected to J 607 std.
summit 1789 cam
stock heads
performer intake
600 QF slayer w/ 1" 4 hole top open bottom spacer
Stock distributor from salvage yard
Dyno headers 1 5/8 - 1 3/4 x 3" x19" collector
16" vac @ 750 idle only 3 deg. advance. Vac can was dead on arrival.
Time 35 deg. @ 4500
Whistled @ 8.4:1
Going in a 4x4 pick up
View attachment 1715848619
Click to expand...

A whistler is a really nice piece of equipment to have--can you share more about that? Oh and this engine will run awesome on 87 octane fuel. J.Rob
 
RAMM said:
A whistler is a really nice piece of equipment to have--can you share more about that? Oh and this engine will run awesome on 87 octane fuel. J.Rob
Click to expand...
Brief description:
One way to describe how it works is to think of 3 beer bottles. One empty, one 1/2 full and one 3/4 full. If you blow across the top of each bottle they will produce a tone from low to high in pitch. The empty bottle having the lowest pitch.
The pitch of the tone represents the volume of air in each bottle.
Less brief:
First Hook a supply of compressed air to the whistler. Then with the calibration bottle hooked to the whistler adjust the flow meter. Calibrate the whistler with a calibration bottle to account for weather/air density. Then choose the correct spark plug hole adapter and insert the the whistler onto the cylinder. The whistler has 2 tubes hooked to it. One to blow air into the whistle and one to listen for the pitch. Next turn the crank to place the piston at TDC. Now enter the cubic inch displacement of the engine and the number of cylinders. The machine now knows the volume at TDC from the pitch and the volume at BDC from the cubic inch and number of cylinders entered and then can then calculate the compression ratio.
 
92b said:
Brief description:
One way to describe how it works is to think of 3 beer bottles. One empty, one 1/2 full and one 3/4 full. If you blow across the top of each bottle they will produce a tone from low to high in pitch. The empty bottle having the lowest pitch.
The pitch of the tone represents the volume of air in each bottle.
Less brief:
First Hook a supply of compressed air to the whistler. Then with the calibration bottle hooked to the whistler adjust the flow meter. Calibrate the whistler with a calibration bottle to account for weather/air density. Then choose the correct spark plug hole adapter and insert the the whistler onto the cylinder. The whistler has 2 tubes hooked to it. One to blow air into the whistle and one to listen for the pitch. Next turn the crank to place the piston at TDC. Now enter the cubic inch displacement of the engine and the number of cylinders. The machine now knows the volume at TDC from the pitch and the volume at BDC from the cubic inch and number of cylinders entered and then can then calculate the compression ratio.
Click to expand...

Thanks for this explanation--Is yours the Katech unit? J.Rob
 
RAMM said:
Thanks for this explanation--Is yours the Katech unit? J.Rob
Click to expand...
Yes. It's a really handy tool to have at the dyno. Many times we have been told incorrect compression ratios for engines that would have resulted in using the wrong octane fuel. More often than not the customer doesn't know what the compression ratio is. It's a fairly quick way to find the compression ratio without tearing the motor apart or guessing. The down side is they are expensive. We charge $25.00 to whistle on the dyno. More if the motor is in the vehicle on the chassis dyno depending how long it takes. I don't think it's paid for itself yet but it's saved my *** a few times and I would be lost with out it.
 
92b said:
Yes. It's a really handy tool to have at the dyno. Many times we have been told incorrect compression ratios for engines that would have resulted in using the wrong octane fuel. More often than not the customer doesn't know what the compression ratio is. It's a fairly quick way to find the compression ratio without tearing the motor apart or guessing. The down side is they are expensive. We charge $25.00 to whistle on the dyno. More if the motor is in the vehicle on the chassis dyno depending how long it takes. I don't think it's paid for itself yet but it's saved my *** a few times and I would be lost with out it.
Click to expand...

If you don't mind what does this unit go for? I "heard" around 10k CDN. J.Rob
 
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