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Jun 19, 2013, 11:38pm

San Antonio 3rd Gen Organization :: Technical Questions :: Engine :: engine assembly

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Topic: engine assembly (Read 378 times)

maxone
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Re: engine assembly
« Reply #15 on May 22, 2010, 4:12pm »

have u ran the Car yet?

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monkihead
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Re: engine assembly
« Reply #16 on May 25, 2010, 7:15pm »

Sorry for the delay, I've been keeping uber busy. I've taken it to the track to only find out my injectors are too small. My 60' times dropped 3-4 tenths to 2.3/2.4. Best time was a 15.7 vs near stock 15.8. I ran the numbers and at 3500rpm I was losing fuel. it would just lean out. I put in bigger injectors and will be taking it to the track in about 2 weeks. With the old injectors, I was maxing them at 240hp. The new injectors should max around 300hp- which is my goal.

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townaj
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Re: engine assembly
« Reply #17 on May 29, 2010, 1:34am »

I wish my 60 ft. times were that good. Today I took mine to the track for the second time and only managed to run a 15.08 with a 2.7 60 ft. Sounds like a beastly car though, maybe I'll see you out there!

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monkihead
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Re: engine assembly
« Reply #18 on May 29, 2010, 2:53pm »

Weather permiting, I'll be going on the 16th. I'm not a guru on carbs, but I've been known to tweak a few. NO edelbrocks, sorry.

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townaj
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Re: engine assembly
« Reply #19 on May 30, 2010, 12:45pm »

I have a Holley so if you could help me out that'd be awesome. I know some stuff but not a whole lot. I'm not a fan of edelbrock carbs either. I gotta remember that date now to see if I can catch you while your there lol. Hopefully I can get my valves figured out by then.

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EricFormula350
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Re: engine assembly
« Reply #20 on May 30, 2010, 4:33pm »

townaj, what kind of motor do you have? What size/series Holley are you running?

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1985 Trans Am 360ci - Original 305 TPI, Power Everything, T-Tops, 4 Wheel Disc Brakes, Rebuilt '88 Corvette 350, Isky 270 Hydraulic Cam, Hooker LT's, True Dual Exhaust w/ Moroso Spiral Flow Mufflers, WC T-5, Borg Warner 9 Bolt w/ 3.27 Gears, Glasstek 4" Cowl Hood

townaj
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Re: engine assembly
« Reply #21 on May 30, 2010, 5:07pm »

Its supposed to be a 383 but it was bored 60 over so its actually a 388. Not sure on the series for the Holley, I just know that its old, and its a spreadbore. Vacuum secondaries and it had electric choke until I took it all off. The cfm is either 600 or 650, don't remember which. Cam came with the block new but without a card. Its from GMPP about .480 lift, unknown duration. Heads are 71-72 Camaro with larger valves. Weiand intake, hedmann headers, scat crank and rods, speed pro pistons, and its a 4 bolt main.

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monkihead
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Re: engine assembly
« Reply #22 on May 31, 2010, 12:18pm »

May 30, 2010, 5:07pm, townaj wrote:

I can't remember a 600 spreadbore by holley, but then again there are many carbs they made I haven't seen yet. I'd put my money on
it being a 650. Most .480 cams are 225-235 duration @ .050. I'd venture to guess your around 380-400hp. If you can get details on your heads I could get a closer estimate.

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townaj
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Re: engine assembly
« Reply #23 on May 31, 2010, 8:34pm »

I'm pretty sure it is a 650 then. But with that much power shouldn't I be running a ton faster than 15.08? I don't have flow estimates or anything if thats what you mean. The compression is somewhere around 9.6:1 if I remember correctly.

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EricFormula350
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Re: engine assembly
« Reply #24 on May 31, 2010, 8:51pm »

If you had that much power you would be running in the low 13's possibly high 12's. There is definitely something wrong. If you have a 383 you really need to be running a 750.

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z28camaroracer
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Trying for 12.0 all motor.

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Re: engine assembly
« Reply #25 on May 31, 2010, 9:22pm »

I will clean off my 84 and bring it out for some fun. I would suggest picking up a mechanical secondary 650 or 750. Set the fuel jets the same on primary and secondary. Currently I an running 76 jets 50cc pump on the primary and 32 sprayers.

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84 z28, All out track car as of 8-1-08 12.2358 @ 111.50 mph
89 IROC clone, with a 350 tpi. 15.2 with the stock cam and tune on drag radials. 14.4 with the new cam and tune on street tires.
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townaj
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Re: engine assembly
« Reply #26 on May 31, 2010, 9:30pm »

I definitely need a new carb. This one leaks pretty bad. I bought it used so thats why I don't know too many details on it. I'm just trying to find a medium point between a gas guzzler and not so bad of one. Thats why I wanted the vacuum secondaries. I know they don't give you as much power, but they have better mileage usually. This isn't an all out drag car, just one I take to have some fun in and blow off some steam.

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