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Finally got the 408 on a Dyno:

 
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jeep_406
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Joined: 12 Sep 2002
Posts: 1661
Location: Tewksbury, Mass 01876
53123.48 points


1972 Chevrolet Nova

PostPosted: Sat Mar 20, 2010 1:59 am    Post subject: Finally got the 408 on a Dyno: Reply with quote

Finally got to make some pulls on an engine dyno. I was happy with the numbers. This is a pump gas iron headed small block that I run in my 72 Nova. Best horsepower reading was at 5700 rmp with a reading of 530.6, developing over 500 hp from5000 RPM til 6300 RPM. Had a pretty broad torque curve being over 500 ft lbs of torque from 3900 to 5500 RPM.

Tomorrow we change the cam and hope to dyno it on Monday. I'll post the numbers when I get a chance.
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Paul P
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Joined: 15 Aug 2002
Posts: 2403
Location: Townsend, Mass.
81574.74 points


1971 Chevrolet Chevelle

PostPosted: Sat Mar 20, 2010 6:39 am    Post subject: Reply with quote

Great start Jeep!
_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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jeep_406
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Joined: 12 Sep 2002
Posts: 1661
Location: Tewksbury, Mass 01876
53123.48 points


1972 Chevrolet Nova

PostPosted: Sat Mar 20, 2010 9:38 am    Post subject: Reply with quote

Thanks Paul,
I forgot to post that the peak torque was 529.9 @ 4700 RPM.
The new cam should take torque away down low allowing me to leave harder.
I realize they are just numbers. The key will be what the change in cams gives me. I'll try to make a video of it.
I want to thank Chad of Golen's Engine Service in Hudson, NH for letting me dyno the engine and make the various changes.

As many of you know, I'm trying to sneak into the 10's with a very streetable car that still has a functioning air conditioning. I've gone a best of 11.08 in good weather but with a pretty strong head wind.
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Paul P
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Joined: 15 Aug 2002
Posts: 2403
Location: Townsend, Mass.
81574.74 points


1971 Chevrolet Chevelle

PostPosted: Sat Mar 20, 2010 12:47 pm    Post subject: Reply with quote

Yes my engine made 20 ft/lbs less torque and about 2 more horsepower. I think horsepower was more or less the same because of the % error in the dyno itself. My peak power was up at 6350 though.
_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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SMOKEmUP
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Joined: 30 May 2002
Posts: 3169

65097.54 points


1979 Chevrolet Camaro

PostPosted: Sat Mar 20, 2010 1:15 pm    Post subject: Reply with quote

Nice numbers Jeep. Tell Chad I said hi when you see him next time.

When will the car be track ready?

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clay
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Joined: 24 Nov 2002
Posts: 3209
Location: South Carolina
318129.23 points


1972 Chevrolet Nova

PostPosted: Sat Mar 20, 2010 3:08 pm    Post subject: Reply with quote

Was this using the Sportsman II's you ported? Fantastic numbers before you change anything. That much torque and still over 500 h.p. make for a fuuuunnnnn street car. Lookes like a well put together package as it sits, can't wait to see if you can improve on it. Clay
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jeep_406
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Joined: 12 Sep 2002
Posts: 1661
Location: Tewksbury, Mass 01876
53123.48 points


1972 Chevrolet Nova

PostPosted: Sat Mar 20, 2010 7:31 pm    Post subject: Reply with quote

Yes Clay that is with the Sportsman II's. My son and I spent a few hours today changing cams. the old one was a Comp hydraulic roller:

.050 intake 236 exhaust 242
lift using 1.6 rockers intake = .555 exhaust = .576
106 centerline
110 lobe separation

The new cam is an Ultradyne:
.050 Intake = 245 exhaust= 249
lift using 1.6 rockers is .612 on both intake & exhaust
105 centerline
109 lobe separation

The old cam was fun on the street with all the torque but on the strip I find if I come 0ut harder than 2000 rpm the car goes up in smoke. I'm hoping the new cam will allow me to come out harder. I'd like to leave around 3000 rpm.

I hope to dyno the new cam either Monday or Tuesday. I'll let you know what we get.
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jeep_406
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Joined: 12 Sep 2002
Posts: 1661
Location: Tewksbury, Mass 01876
53123.48 points


1972 Chevrolet Nova

PostPosted: Sat Mar 20, 2010 7:55 pm    Post subject: Reply with quote

Smoke,

I'll tell Chad you said hi.

I hope to be able to run the car when the first Nostalga race takes place. I'm waiting for a trans shield for my 700R4 that's on backorder from Jegs.

I have a neck problem that's giving me some grief, pinching nerves in my right shoulder and arm. That's been keeping me from doing much for about 8 weeks. Because of this I'll have to run a reduced schedule at least in the beginning of the season.
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Skunkworkx
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Joined: 02 Sep 2007
Posts: 352
Location: Harford Co. Maryland
10318.16 points


1968 Chevrolet Camaro

PostPosted: Sat Mar 20, 2010 10:21 pm    Post subject: Reply with quote

Nice numbers.... what the combo... or is it a secret ?
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jeep_406
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Joined: 12 Sep 2002
Posts: 1661
Location: Tewksbury, Mass 01876
53123.48 points


1972 Chevrolet Nova

PostPosted: Sun Mar 21, 2010 6:03 am    Post subject: Reply with quote

Skunkworkx,
It's 2:20 am so I'll use that as an excuse if I miss something. Let me know if I leave something out.

Stock 400 block bored .040 with deck plates.
Block decked & squared and machined to zero deck height.
Put plugs in the water jacket for strength.
Align honed the mains.
Wish I had splayed main caps installed but I didn't. No excuse, I just did not think of it at the time.
I use studs with stock main caps.
CAL-CS-400-2PC Callies nitrided Comstar crank.
SCT-21CR6000-7/16 Scat Pro Comp 6" I beam rods/floating pins.
SBC125165126 Mahle forged pistons/ 26 cc dish & light tension rings filed to fit.
I wish I went for a piston with more compression Sad
Assembly balanced by Golen Engine Service of Hudson, NH.
Comp Cams XR288HR-10 Hydraulic roller installed straight up.
6100 Comp Cams drive belt assembly.
SCP-1002 Scorpian 1.6 rocker arms.
COMP 7944-16 Comp push rods.
ATI 917780 Super Damper.
CLV-CB-663H Rod Bearings.
CLV-ms-1038H-1 Main set.
I think that is everything for the block.

The heads are Sportsman II's that I played with on a Superflow 110 bench that I got from a friend years ago. The flow numbers were at 10 inches and using a Superflow formula converted to 28 inches. Here are the parts. I couldn't find the actual slip on the valves.
Intake are 2.055 Fierra 6000 series.
Exhaust uses 1.6 Fierra 6000 series.
PAT-8401 Patriot valve spring kit with titanium retainers.
Flow Numbers on the heads:
Intake
200/139
300/192.7
400/224.6
500/241.7
550/246.5
600/249.6

Exhaust
.200/108.1
.300/141.8
.400/176.1
.500/198.7
.550/206.2
.600/212.0

These are the average numbers taken by me on my flowbench. I never had them checked by anyone on another bench. I was really pleased with what I got out of the exhaust side but disappointed with the intake. As I remember I started with 230 ish on the intake and 143 on the exhaust @ .550 lift. I don't profess to be a head guru. If memory serve me correctly I opened the bowl to 85 or 90% of the valve size and cut down the guides and did considerable work on the short side radius.
Because of the piston used, we cut the heads down to 56cc's from 64cc's. That brought the compression to 10.22
Of course that meant we cut the intake to fit. If in the future I go with a good set of heads I'll change pistons. I wouldn't want to cut a new set so severely.

The intake is a Bowtie Victor Jr with a little cleanup work.

I run a 750 3310 vacuum secondary carb with a Proform body and base. It flows 834 on my Superflow 110. It's jetted 76's in the primaries with a 5.5 power valve and 89's in the secondaries with no power valve. I've tried a 750 DP, 900DP and a 1050 Dominator with an adapter to fit my manifold and didn't see any improvement in my time slips. I always get kidded about my choice of carb but it works and I haven't found anything better.
I run a K&N filter with the filter on top as well as from the sides. I run an air dam or box to keep heat from entering the carb. I have a forward facing hood scoop.
I run an MSD 6AL box with an MSD distributor with a vacuum advance. It's good for a couple of MPG on the street.

I think I covered everything on the engine.
I run a 700R4 with a Precision Industries torque converter with a 3500 stall and the conveter has the lock up provision. At the track I lock it up at 90MPH in 3rd gear which is just before the 1/8th mile. I don't have the figures in front of me but it's good for about 1.5 MPH inthe 1/4.
The rear end in a 12 bolt with 4.10 gears and a Moroso Brute Force center. The axles are from Moser and I run C-clip eliminators.
I use Mickey Thompson 275/60R15 ET Street radials and love them. I run them on the street and at the track. Get a new set just about every year. I tried running street tires on the street but they would blow away way too easily. The ET street allow for a much safer ride. I don't drive the Nova in bad weather conditions although I've had to come back from the track in rain. As long as I drive it easy it's fine in the rain. I run 26X600x15 Mickey Thompson Sport radial skinnys on the front.
I use all of the Caltrac stuff. The mono split leaf springs with adjustable shocks in the rear and their front shocks. I used to have Comp Engineering shocks in the front and found John Calvert's front shocks release much quicker.
I've got poly bushings in the front a-frames. Ive got the a little on the loose side and double nutted. The front end moves very well and remains very stable on the highway. I don't run a sway bar and was surprised with how stable the car drives using the off ramps. I have stock 72 Nova manual steering. I think that's about everything. I'm going back to bed Laughing
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Skunkworkx
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Joined: 02 Sep 2007
Posts: 352
Location: Harford Co. Maryland
10318.16 points


1968 Chevrolet Camaro

PostPosted: Sun Mar 21, 2010 10:57 am    Post subject: Reply with quote

Confused thanks Smile

2am and all that Shocked LOL

sounds like a damn good combo and the numbers look great too. can't wait to see your numbers from the track.

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68 Camaro LSx
AKA:RedЯum
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jeep_406
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Joined: 12 Sep 2002
Posts: 1661
Location: Tewksbury, Mass 01876
53123.48 points


1972 Chevrolet Nova

PostPosted: Sun Mar 21, 2010 12:27 pm    Post subject: Reply with quote

Those dyno figures of the setup I ran last year. We took those runs to get a base so I could see if a new cam helps or hurts my quest for the 10's.
The thought being that if I soften up the 408's lower end I'll be able to come out of the hole at a higher rpm without blowing the tires away and hopefully make more hp upstairs. The car shifts into 2nd gear just before the 60 foot and drops to 5300 rpm so I'm looking to increase hp above that mark.
I tried to attach a copy of the dyno sheet but it wasn't allowed. If anyone wants a copy they can PM me with their email address and I'll be glad to send it to you.
Driving
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squeeezer
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Posts: 2427
Location: new richmond WI
191524.76 points


1991 Chevrolet Camaro

PostPosted: Mon Mar 22, 2010 5:13 pm    Post subject: Reply with quote

i predict that cam will pay divedens across the board due to the increased duration and tighter lsa

which cam has a later int. closing? just curious

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