Cam upgrade.... Any thoughts"
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From: river
I think your exhaust choice is going to have 10 times more affect on your tq curve than your cam selection. It seams to me most of the bigger, more radical cams still make good power down low. What radical cams are you thinking of?
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From: river
A set of smash or crush heads from hammer, a 42 or 45 mikuni, an adjustable ignition, pick out exhaust based on tq curves they produce, 560 or 600 hammer cams or 536 575 Screamin chicken cams. You will have an animal from 2500 to 7000 grand.
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Road Master
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From: South Central Pennylvania
This interesting to me because I've never done to a Harley what I've usually done to my cars.
You guys probably think I'm crazy but I want something different. That low end grunt is great and it works for the low rpm Harley. I do think they can be pushed to a higher rpm, say 7K on a daily basis, without problem by installing the right parts.
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From: river
I think you are absolutely right Madness - I know from racing cars it's finding the right combination that makes the whole package work.
This interesting to me because I've never done to a Harley what I've usually done to my cars.
You guys probably think I'm crazy but I want something different. That low end grunt is great and it works for the low rpm Harley. I do think they can be pushed to a higher rpm, say 7K on a daily basis, without problem by installing the right parts.
This interesting to me because I've never done to a Harley what I've usually done to my cars.
You guys probably think I'm crazy but I want something different. That low end grunt is great and it works for the low rpm Harley. I do think they can be pushed to a higher rpm, say 7K on a daily basis, without problem by installing the right parts.
I would agree on the 7k comment. I pushed mine last year down the track 80 times hitting 7200. I put a couple 100 dyno pulls on it up to 7400. Im hoping to have hard pulling power up to 7300 7400 this year with 600 cams and 1.980 intake valves with a 45 and custom intake. I just checked the runout on my crank at the very end and it is only about .001
Last edited by Madnss; Feb 12, 2013 at 02:52 PM.
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Road Master
Joined: Nov 2012
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From: South Central Pennylvania
Yep, exhaust can have a large effect on the performance of the engine. I'm kind of open for suggestions as I haven't looked to close at what's out there.
I've been looking a lot at the Hammer website and it's almost a one stop shop for most things. I'm looking at various cams but probably something with a life around 650 lift and duration in the 250 270 range. Duration seems a little low compared to what I ran in my V8 street engines but we'll see.
Hammer has some great heads and I'll probably go with one of the higher end units. I'm not going to go for the 1250 kit, don't think it necessary.
What carb to use I'm really up in the air about and I don't think a Holley double pumper would look right hanging out the side.
Been trying to find the cfm rating on some of the carbs then I can figure out what size to use.
Any ideas try and let me know... Thanks for your input..
Last edited by backplay; Feb 12, 2013 at 05:55 PM.
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From: river
You cant beat a 42 or 45 mikuni for power and ease of tuning. I ran a 42 for years and now im bumping up to a 45. Hammer has a new 660 cam out, but Aaron of Hammer perf would like to see it in 88" and above. I think he said its a little much for a 1200, even a hot 1200. Their 600 cam puts out some serious power. redshift makes some nasty cams too, like the 585. If your going to be putting in a monster cam, i strongly suggest the 1250 kit of hammers. I didnt buy the kit for the extra 50cc at all. Ive been burnt on uneven junk factory cylinders when i started climbing into the mid 90 hp range. the structure and durability on the jugs is ten times of factory jugs. The cp pistons they have are also super light. They are having a sale right now on xlforum. Its crazy cheap....you cant bore/hone factory cylinders and buy a good forged piston for what they are selling them at. There are not very many cams out there in the 650 lift range. They are making north of 110 hp with 600s.
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From: river
As aaron of hammer perf has said a million times. Its not what you have on your engine, its the one or two parts you dont have that usually holds it back. The r&d they are doing is crazy. My hammer engine did exactly what they said it would, I was about 2 hp off the ballpark it should be in. If your spend 2000 grand on upgrades, whats a few more dollars here or there to have the thing perfectly to maximum power.
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From: river
https://www.hdforums.com/forum/sport...eets-vids.html
There are some dyno sheets, vids and pics in this thread. I logged a lot of stuff last year from my hammer engine.
There are some dyno sheets, vids and pics in this thread. I logged a lot of stuff last year from my hammer engine.
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Road Master
Joined: Nov 2012
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From: South Central Pennylvania
You cant beat a 42 or 45 mikuni for power and ease of tuning. I ran a 42 for years and now im bumping up to a 45. Hammer has a new 660 cam out, but Aaron of Hammer perf would like to see it in 88" and above. I think he said its a little much for a 1200, even a hot 1200. Their 600 cam puts out some serious power. redshift makes some nasty cams too, like the 585. If your going to be putting in a monster cam, i strongly suggest the 1250 kit of hammers. I didnt buy the kit for the extra 50cc at all. Ive been burnt on uneven junk factory cylinders when i started climbing into the mid 90 hp range. the structure and durability on the jugs is ten times of factory jugs. The cp pistons they have are also super light. They are having a sale right now on xlforum. Its crazy cheap....you cant bore/hone factory cylinders and buy a good forged piston for what they are selling them at. There are not very many cams out there in the 650 lift range. They are making north of 110 hp with 600s.
Something to think about with the larger cam. A radical cam in a smaller engine will tend to be well, more radical sounding whereas that same cam in a larger engine is more streetable. Definitely something to consider. I don't want it to be unridable.
What ignition are you running?
Thanks again for your input, you're as crazy as I am...
