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May 24, 2013, 9:58pm

San Antonio 3rd Gen Organization :: Technical Questions :: Engine :: Cam choices

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Topic: Cam choices (Read 106 times)

monkihead
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Cam choices
« Thread Started on Jan 18, 2010, 11:20am »

It was a topic of discussion at Bigs and I didn't know my grind number. I wanted something mild, under .480 lift, yet something that could throw me over the 280-290hp range.

CompCams - tpx254hr-15 ~ 08-530-8

I was also contemplating -

Lunati 50143

I already have the Comp on the shelf, so it will be going in next month.

« Last Edit: Jan 18, 2010, 11:21am by monkihead »

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maxone
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Re: Cam choices
« Reply #1 on Jan 18, 2010, 4:43pm »

whats up monkihead!!! ok so your saying that the compcam is ok 2 use on my camaro its all stock with some mods.

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monkihead
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Re: Cam choices
« Reply #2 on Jan 18, 2010, 10:01pm »

Yes and no. Yes it will fit but, due to lack of fuel it will need to be re-tuned. Not to mention upgraded injectors, regulator and pump. As it was, you could feel the power loss in my car as it hit higher rpms.

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Lucid
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1986 Chevy Camaro Z28

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Re: Cam choices
« Reply #3 on Jan 19, 2010, 4:43am »

Comp Cams Tri Power Xtreme Camshaft : tpx254hr-15

Basic Operating RPM Range: 1,200-5,200 rpm
Duration @ .50 : 206 int./212 exh
Lift w factory rockers : 0.477 int./0.471 exh. lift
LSA: 115 degrees

This should make for an interesting 305 Monikhead. Email me your .bin and .xdf so I can take a look at your fueling.

This is a hydraulic roller cam Maxone. You have a hydraulic flat tappet or roller cam block in your car?

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monkihead
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Re: Cam choices
« Reply #4 on Jan 19, 2010, 12:41pm »

I'll send a copy tomorrow, I didn't bring my ext. hd with me to work. My fueling is going to change when I put in the cam anyway.

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maxone
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Re: Cam choices
« Reply #5 on Jan 19, 2010, 2:20pm »

lucid my rs is a rollercam. ill take it next time we go out its fast i just needed faster lol i just now put the posi rear end with i think 3
374 gears i think..... i have to look 4 my paper work.

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Lucid
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Re: Cam choices
« Reply #6 on Jan 19, 2010, 5:45pm »

http://www.customclassictrucks.com/techa....hevy/index.html

"TBI Cylinder Heads

The first attempt to create a swirl with the air/fuel mixture came when GM designed a special head for the small-block engines that used the throttle body fuel injection (the TBI engine). These engines were manufactured between 1987 and 1995, and were option code LO3 for the 305 and LO5 for the 350.

The heads have one side of the intake port formed into the shape of a ramp to put a swirl into the air/fuel mixture as it is pulled into the combustion chamber. The design works well to increase low-speed torque and fuel economy but restricts high-rpm power.

Although the 305 TBI produced 170 hp and the 350 TBI produced 210 hp, these engines have a reputation for being under-performers. Because the new restrictive heads were installed along with the new fuel injection system, the disappointing performance was wrongly blamed on the change from carburetion to fuel injection.

The intake ports on the TBI heads look pretty strange to many of us that are familiar with the traditional small-block intake ports. Not many attempts have been made by engine builders to use these heads on performance engines. Although the intake ports are large -- they hold 185 cc's of liquid -- the TBI heads were never used on the high-performance 305 or 350 Tuned Port Injection Camaro or Corvette engines or the 305 and 350 marine engines. These engines used heads with the traditional intake port.

Installing traditional small-block cylinder heads on a 305 or 350 TBI makes them into better performing engines. GM has a replacement head (PN 10125377) for this engine that has the traditional intake port. Externally, it looks identical -- the combustion chambers and valves are the same size and shape, it uses the same valve covers, and has the same intake and exhaust manifold bolt patterns. Installing these heads will give the engine a stock appearance, maintain the durability of the stock engine, and, at a slight decrease in fuel economy and torque, increase horsepower at the top of the rpm range. "

Another interesting post on heads and TBI performance

http://www.thirdgen.org/techboard/tbi/336750-tbi-tpi-heads-headflow.html

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monkihead
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Re: Cam choices
« Reply #7 on Jan 19, 2010, 6:34pm »

thats why the cam I chose isn't very large or radical. I could easily found a larger cam, but it probably wouldn't give me the power I want-where I want it.

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Lucid
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Re: Cam choices
« Reply #8 on Jan 19, 2010, 8:00pm »

Lunati 343hp 305 Build

http://www.hioutput.com/tech/343hp/343hp.html

These are 416 heads and its a hydraulic flat tappet but as you can see, 305s can make some good power.

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z28camaroracer
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Trying for 12.0 all motor.

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Re: Cam choices
« Reply #9 on Jan 20, 2010, 12:26am »

That is one problem I have with my 89 is the heads are the swirl-port truck heads. I have thought about finding a better set of heads, most likely a set of aluminum heads. But I think the best combo wouls be the vortec heads with the vortec tpi base plenum and slp runners.

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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.
98 ss, #0890 Totaled at 184609 miles on 2/14/2013 at 2:30 am.

monkihead
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Re: Cam choices
« Reply #10 on Jan 20, 2010, 11:29am »

Jan 20, 2010, 12:26am, z28camaroracer wrote:

the l31 vortec heads would be the most cost effective. An aluminum Edelbrock or ProComp would be an upgrade due to weight loss.

I may have a set of l31's around here somewhere. Will let you know.

Quote:

Lunati 343hp 305 Build

http://www.hioutput.com/tech/343hp/343hp.html

These are 416 heads and its a hydraulic flat tappet but as you can see, 305s can make some good power.

Yeah, but I don't plan on switching heads. My goal is a bit awkward, but has a purpose. This isn't a street/strip car. Its a street car with comfortable power.

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