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Old 02-10-2013, 06:46 PM
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Desktop Dyno

hello can someone desktop dyno my combo for me. I would really appriciate it.


355 sbc 010 block, Hyper dished pistons (9:1 compression)
492 heads with 2.02 / 1.60 valves, screw in studs and guide plates
roller tipped steel rockers (1.5)
performer 2101 intake 1/2" spacer
holley 670 vac secondary carb and HEI dist 65,000 volt
Flowtec Long tube Headers and 2.5" exhaust flowmaster super 40 mufflers
Comp cams 268HE flat tappet cam, .454 lift

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Old 02-10-2013, 06:53 PM
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Need flow on the heads an .050 on camshaft or camshaft link or part number to get a ball park figure.
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Old 02-10-2013, 06:54 PM
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out of my left cheek I guess over 300 ish
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Old 02-10-2013, 07:15 PM
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Originally Posted by Bowtie man View Post
Need flow on the heads an .050 on camshaft or camshaft link or part number to get a ball park figure.
cam .454 / .454
110 lobe sep
106 intake centerline
duration 268
duration @ .050 is 218
12-210-2 - HIGH Energy

2.02/1.60" valves, 64CC combustion chambers, intake port volume should be 161CC's, exhaust port volume should be 62CC's

thats all i got !!!
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Old 02-10-2013, 07:24 PM
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if its hydraulic flat tappet, about 280 to 300 ish with that intake and carb,with decent headers of course
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Old 02-10-2013, 07:45 PM
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I cam up with 300 HP all over by 5000 RPM's. Had to guess at the flow numbers off of what you said. With mufflers around 280 or so. Did not run it with mufflers. Ran it with just open headers.
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Old 02-10-2013, 07:51 PM
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Originally Posted by Bowtie man View Post
I cam up with 300 HP all over by 5000 RPM's. Had to guess at the flow numbers off of what you said. With mufflers around 280 or so. Did not run it with mufflers. Ran it with just open headers.

what was the tq looking like? i was figuering like 300 to 330hp
the tq should be good with this setup i think throughout the power band
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Old 02-11-2013, 07:08 AM
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You living in E-town has one of the best tracks in the country to test and tune.
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Old 02-11-2013, 12:01 PM
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Quote:
Originally Posted by JasonL View Post
hello can someone desktop dyno my combo for me. I would really appriciate it.


355 sbc 010 block, Hyper dished pistons (9:1 compression)
492 heads with 2.02 / 1.60 valves, screw in studs and guide plates
roller tipped steel rockers (1.5)
performer 2101 intake 1/2" spacer
holley 670 vac secondary carb and HEI dist 65,000 volt
Flowtec Long tube Headers and 2.5" exhaust flowmaster super 40 mufflers
Comp cams 268HE flat tappet cam, .454 lift
My experience with real dynos would cause me to expect about 330 to 340 horses at 5300-5500 RPM with 370 to 380 lbs/ft of torque at 3600 to 3800 RPM.

A lot is going to depend on the details:
- Piston crown style, round dish versus D dish. The round dish reduces squish/quench effects. This will cost power across the rpm range.

- The 492 came in straight or angle plug, the angle will deliver at higher compression ratios without detonation coming on to limit advance thus power output with this head. 2.02 intakes are more than needed with this cam while the port capacity is less than ideal.

- 1.6 rockers would help the porting by getting the valve off the seat faster, this works really well when combined with back cut valves as particularly when you use these heads they respond to improving early lift flow which back cutting does.

- As for spacers, this is something you have to experiment with sometimes they work, sometimes there's no real effect, and sometimes the effects are negative; so you need to cut and try to see what the engine likes.

- A larger Holley and a Performer RPM would pump up the top end with little cost to the bottom end numbers.


Bogie
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Old 02-11-2013, 05:12 PM
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Torque max was right at 380. It was finished about 4200 or so. Working off memory from this morning already cleared it out. There are still a lot of variables that are not calculated. But, this is fairly close.
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Old 02-11-2013, 07:48 PM
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Thanks

Thanks for the replies. I was just looking for a approx. This is going in a street car / daily driver type. Its a full weight 1980 Monte carlo. I stayed with the performer intake because I am running air conditioning and all power options. I swapped in a 200 4r trand and a 3.73 rear gear. I am looking for some low end torque to have some fun on street !!! I will probally go to the track maybe 1 time a year, would love it to run a 13.0 which I think will be possible.
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Old 02-11-2013, 07:55 PM
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X2 on going to a test and tune. The Desk Top Dyno usually produce numbers on the high side so I usually dont take them to serious.

Hit the track and you'll have fun finding out what the HP is. 13.0 might be a stretch but a mid to high 13 looks promising.
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Old 02-11-2013, 08:02 PM
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true

Quote:
Originally Posted by prostreet6t9 View Post
X2 on going to a test and tune. The Desk Top Dyno usually produce numbers on the high side so I usually dont take them to serious.

Hit the track and you'll have fun finding out what the HP is. 13.0 might be a stretch but a mid to high 13 looks promising.
very true, i think a mid 13 with some sticky tires is very possible with this combo. between the gear and the built trans, i also have a good set of rear control arms. Should bite well. But main concern is FUN on street !!! taking the kid for rides to car shows etc !!!
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