Technical > Matt Shaff's Engine Shop
4 7 and 4 7 2 3 swap cams
wideopen231:
Yea there is about 100 articles on line. 4 or 5 say same thing. LOL My view is if I can get 4 7 swap for same money and have not seen any real down side, why not. Changing back is matter of swapping two wires on cap. If it smooth's out harmonics then I'm good with that too. May be a while. Even the cam being better fit is only 40#tq gain and that's for only about 1250 to 1500 rpm range then its almost nothing. The 296-500 cam I have is about 12 to 18* too much 296 @ .050. But hey its sitting here and cost zero plus have 2 of them.
Roger:
That was the point, lots of opinions and no absolute answers:) The swap doesn’t appear to have a negative effect on performance so it may be worth a try. Or maybe have one of your existing cams reground with less duration?
dreracecar:
You will not get any absolute answers here because every combo people run here is different. Like I said before, if the swap made any significant gains and all the racer had to do was swap 2 wires, why would the cam grinder offer any other verson??? Isnt the purpose of a cam grinder is to make a better product.
Customer came in a few months ago with a damaged cam, the needles came apart in a roller lifter and wanted to know what I thought because he had a race in 2 weeks. It was a Bullet Can (very nice) but numbers did not match any listing, It was a custom grind for the original engine builder and made to order. sent it back for repair (with shipping a 10 day turnaround) in the meantime installed a comperable non swap cam and new lifters. He was racing Super Comp on a index and just dialed the car in and went rounds until his brain melted and had a horrible RT.
masracingtd1167:
When we used to dyno the Comp motors we tried different cams with the 2 cyl and 4 cyl swap and never saw much of a gain ! The best thing you can do is talk to your cam builder and let him make a decision on what cam to use and give him as much information as possible !
ricardo1967:
--- Quote from: dreracecar on June 11, 2017, 09:43:56 AM ---Like I said before, if the swap made any significant gains and all the racer had to do was swap 2 wires, why would the cam grinder offer any other verson??? Isnt the purpose of a cam grinder is to make a better product.
--- End quote ---
Well Bruce, I have a different perspective here. They can charge extra $ for the 4-7 swap. Basically the same reason why McDonald's offers hamburgers and cheeseburgers.
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