Who is doing 4 - 7 firing order swap.
09-29-2006, 08:22 AM
#11
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Re: Who is doing 4 - 7 firing order swap.
I have used a 4/7 swap cam since about 1990 when I ran ProStock. We it in many offshore N/A combination and Drag Race engines daily. I have seen an honest 10-15 Horsepower on average.There is alot of camshaft technology that we use in Drag Racing that I am incorporating into our marine engine packages. I have also done a extensive amount of testing with a 1-8-7-2-6-5-4-3 firing order which we have found very good results with. If you notice 2 & 3 are swapped along with 4 & 7.
Dean Gellner
Dean Gellner
09-29-2006, 11:29 AM
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Re: Who is doing 4 - 7 firing order swap.
Originally Posted by Wobble
Thanks for the reply Bob, I was looking into this for our UMP late model engines as a possible "cheap" upgrade during the next freshen up. I read a reply you made on another forum in 2004 on this subject. I think it looks like a sensible option for the rpm's that we are turning in our 427 smallblocks.
I am also looking to add Pan-E-Vac systems as I think that is also an inexpensive "incremental" upgrade that will possibly also help with the alcohol contamination.
I am also looking to add Pan-E-Vac systems as I think that is also an inexpensive "incremental" upgrade that will possibly also help with the alcohol contamination.
Last edited by Car Biz; 09-29-2006 at 11:33 AM.
09-29-2006, 11:43 AM
#13
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Re: Who is doing 4 - 7 firing order swap.
Originally Posted by Car Biz
Who is the engine bulider for the UMP motor. And where do you run at? I tried to vent the crankcase with one of those systems a long time ago on a motor and made no diff. with the contamination. We just changes oil every three nights and put a heater on the drysump tank to heat the oil. That way when you put the "heat up plate" in front of the radiator and the oil is hot it makes the motor heat up faster to help condinsation.
Not allowed to run drysump around here except in the SUPR Late Models. This means that we have to run the motors in the pits and on the hot grid to get temp. Oil is changed every two race meets.
09-29-2006, 11:48 AM
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Re: Who is doing 4 - 7 firing order swap.
Originally Posted by Wobble
Our engine builder is JK Engines in the Bellaire section of Houston. We run Texas, Louisiana and Oklahoma.
Not allowed to run drysump around here except in the SUPR Late Models. This means that we have to run the motors in the pits and on the hot grid to get temp. Oil is changed every two race meets.
Not allowed to run drysump around here except in the SUPR Late Models. This means that we have to run the motors in the pits and on the hot grid to get temp. Oil is changed every two race meets.
09-29-2006, 08:10 PM
#15
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Re: Who is doing 4 - 7 firing order swap.
Originally Posted by Wobble
Our engine builder is JK Engines in the Bellaire section of Houston. We run Texas, Louisiana and Oklahoma.
Not allowed to run drysump around here except in the SUPR Late Models. This means that we have to run the motors in the pits and on the hot grid to get temp. Oil is changed every two race meets.
Not allowed to run drysump around here except in the SUPR Late Models. This means that we have to run the motors in the pits and on the hot grid to get temp. Oil is changed every two race meets.
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