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  #81  
Old 02-18-2017, 10:29 PM
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Tom it is pretty accurate on the 5250?

Interpolate using these from the high HP one:

RPM - _HP______TQ
5195 - 518.9__ 524.6
5261 - 520.2__ 519.3

Comes out within a hundreth or so.



The 'flatness' is probably from the cam being small?
(for the head flow)


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  #82  
Old 02-18-2017, 10:40 PM
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Tom, they did cross at 5252, it's just that the sheet doesn't show 5252, but instead it shows 5261[on the 4'th sheet down], and it shows 520.2tq, and 519.3 HP.

Will, what he means is torque and HP are always equal at 5252 RPM. After all, the formula for figuring HP is torque x RPM divided by 5252 = HP. So, torque and HP will always cross, or be the same, in other words, at 5252 RPM.

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  #83  
Old 02-18-2017, 10:51 PM
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Okay, makes sense now. Thanks

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  #84  
Old 02-18-2017, 11:19 PM
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Got it Paul,was looking at the wrong sheet that ended before there.Tom

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  #85  
Old 02-18-2017, 11:50 PM
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Just a small case of engine envy here....

Well done!

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  #86  
Old 02-19-2017, 12:19 AM
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Thanks Will!

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'69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears
‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears
'64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears (Traded)
'69 LeMans Vert, 350, #47 heads: Non-running project
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  #87  
Old 02-19-2017, 01:30 AM
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Definitely will be following the progression of your ride.

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  #88  
Old 02-19-2017, 09:46 AM
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Quote:
Originally Posted by tom s View Post
Great numbers also just the question why it went flat at what seems early?Valve springs?Tom
Spring pressure over the nose is 369 iirc. I would have liked it a bit higher.

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'69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears
‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears
'64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears (Traded)
'69 LeMans Vert, 350, #47 heads: Non-running project
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  #89  
Old 02-19-2017, 10:36 AM
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Good numbers and a nice wide rpm spread between peak torque and peak power.


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  #90  
Old 02-19-2017, 10:44 AM
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The governor on my th400 is set to shift at 5200- any reason to move it considering dyno results?

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'69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears
‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears
'64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears (Traded)
'69 LeMans Vert, 350, #47 heads: Non-running project
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  #91  
Old 02-19-2017, 10:59 AM
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Whens the engine gonna be in the car And running...and Its not worth anything without Video...we are all expecting some kinda burnout video.....

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  #92  
Old 02-19-2017, 11:31 AM
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Quote:
Originally Posted by johnta1 View Post


The 'flatness' is probably from the cam being small?
(for the head flow)
Yeah the cam is small for the size of the engine so that's one consideration. I think he also mentioned they installed this cam at 107 so that may be another reason it looks like it quit early. But the torque curve is nice, perfect for a fun street car with no rear gear.

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  #93  
Old 02-19-2017, 11:34 AM
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Quote:
Originally Posted by grivera View Post
The governor on my th400 is set to shift at 5200- any reason to move it considering dyno results?
Me personally, I wouldn't. looking at that really nice torque curve I'd leave your governor alone. It's more street car anyway. If for some reason you hit the track and want to experiment, you could always shift manually a little higher and see if it helps your ET. But looking at the torque curve I think you'll see very little difference moving your shift points higher which in my eyes doesn't make fooling with the governor worth while. That'll be a fun engine.

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  #94  
Old 02-19-2017, 11:48 AM
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Quote:
Originally Posted by Formulajones View Post
Yeah the cam is small for the size of the engine so that's one consideration. I think he also mentioned they installed this cam at 107 so that may be another reason it looks like it quit early. But the torque curve is nice, perfect for a fun street car with no rear gear.
It was set at 107.5 based on cam card of 107. SD Dave opined it was fine at this setting and since it isn't a max effort build I'm happy.

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'69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears
‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears
'64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears (Traded)
'69 LeMans Vert, 350, #47 heads: Non-running project
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  #95  
Old 02-19-2017, 12:01 PM
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Whens the engine gonna be in the car And running...and Its not worth anything without Video...we are all expecting some kinda burnout video.....
Hopefully by April. The weather has been beautiful here - 70s today! Just need the work schedule to cooperate...

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Will Rivera

'69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears
‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears
'64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears (Traded)
'69 LeMans Vert, 350, #47 heads: Non-running project
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  #96  
Old 02-19-2017, 12:08 PM
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Originally Posted by grivera View Post
It was set at 107.5 based on cam card of 107. SD Dave opined it was fine at this setting and since it isn't a max effort build I'm happy.
Okay I thought you said that somewhere. I mentioned it due to the engine peaking early comments. Probably could have moved that out a couple degrees for more peak HP at a slightly higher RPM but frankly I don't see the need to do that. It has a very nice torque curve that will be a blast on the street. I'd leave it alone.

Another piece of info on the shift points. My bird also has a very flat torque curve on a very stock build. My trans governor shifts around 5300 or so (if the factory tach is correct) I've raced the car extensively and I've shifted it all over the place, as high as 5700. I gained nothing in ET or MPH. Leaving it in drive works just as well and easier on the motor. So I raced then on with the shifter in drive.

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