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| Cam poll https://www.slantsix.org/forum/viewtopic.php?t=39153 |
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| Author: | OleNatesOlds [ Thu Feb 25, 2010 8:57 am ] |
| Post subject: | Cam poll |
Lets hear your nominations for a cam in a daily 225 street motor around 9.5:1 compression, a-body, auto, mild porting, F.I., Clifford intake, (maybe) headers, high 2. to low 3. gears with some semblance of fuel economy but I'd like to get at least 1hp/ci. I'd like to get 250hp or better... |
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| Author: | Doc [ Thu Feb 25, 2010 9:16 am ] |
| Post subject: | |
Converter stall speed? How do you like your idle quality and off-idle responce? (1000 to 2500 rpms) DD |
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| Author: | OleNatesOlds [ Thu Feb 25, 2010 9:34 am ] |
| Post subject: | |
It's a stock '69 converter now and was hoping I wouldn't need to upgrade if I control my right foot pressure most of the time. But if I find a A855od that's getting in there. I don't mind a little lope, but I don't want to start creating rattles or not be able to read the gauges at a light. I'll need vacuum for power brakes. I'll have passengers. I don't want to have to snap their necks to get going from a dead stop. |
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| Author: | Dart270 [ Thu Feb 25, 2010 9:38 am ] |
| Post subject: | |
I would highly suggest the Erson 280/270 cam degreed at 101 centerline, and a 2500-2700 stall converter. Very docile and almost like stock until you stand on it. You will need a good amount of headwork to hit 250 HP with 9.5:1 and a mild-ish cam. Lou |
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| Author: | Aggressive Ted [ Thu Feb 25, 2010 10:58 am ] |
| Post subject: | |
Lou, What is the mileage??.....that was the other part of the question... Will it get 25 mpg? like my E254 or RV10. What rpm does the Erson 280/270 cam start to provide power? What is the vacuum reading at that rpm once you get going? |
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| Author: | zorg [ Thu Feb 25, 2010 11:36 am ] |
| Post subject: | |
No exact numbers yet, but I'm estimating ~25mpg highway with a 280/270 grind. |
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| Author: | sandy in BC [ Thu Feb 25, 2010 12:28 pm ] |
| Post subject: | |
Good questions Ted. The low end torque on this cam is simlar to stock and the mid range is much stronger. I have 5 gears so mileage is more a factor of aerodynamics and user tendencies. Big torque starts at about 2500rpm. No vacuum readings. I have a BBD and the vacuum signal is very strong, very responsive throttle. There is no reason to think this cam would get less mileage than a stock cam and compelling reasons to think you would do better at cruising speed. At WOT....not so much. I think 180-200 hp is a more accurate measure of this cam with 9.5:1. It would take a ton of headwork/fuel to get 250hp and streetability would be lost. |
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| Author: | Dart270 [ Fri Feb 26, 2010 5:51 am ] |
| Post subject: | |
Well, I've gotten 24-25 MPG with a BIG cam (250 @ 0.050", 0.510") and ~250 HP, so I believe cam does not do as much as overall combo of parts and tune. I see no reason why this cam shouldn't get good mileage if the engine is designed around it. Mark Ethridge is making about 260 HP with this cam, but he has a really good head and has tuned the heck out of his motor. Lou |
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| Author: | madmax/6 [ Fri Feb 26, 2010 9:07 am ] |
| Post subject: | |
My motor actually doesnt have 260 hp.I got 197 rear wheel on the dyno.Head never has been flowed so I really dont know how well I did it.I do have 10.7 compression.I do LOVE the 270 280 Erson cam,very good choice.Mark |
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| Author: | Dart270 [ Fri Feb 26, 2010 9:41 am ] |
| Post subject: | |
I calculated 210 RWHP from your 1/4 mile speeds. So maybe you have 250 HP at the crank (200 RWHP), but in that neighborhood. Anyway, a good engine! Lou |
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| Author: | madmax/6 [ Fri Feb 26, 2010 5:31 pm ] |
| Post subject: | |
Thats about what I figure too.Think I picked up some hp since the Dyno pulls,I know car picked up a 10th with the cold air intake tubes.Mark |
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| Author: | OleNatesOlds [ Fri Feb 26, 2010 5:38 pm ] |
| Post subject: | |
Besides a converter upgrade, what might I need to do to the auto trans? |
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