The 6 has 2 more cylinders!!!

 

I also have a 4bt and 6bt and yes the 2 more cylinders make a diffence when starting and the 4bt is just 12 volt system and the 6bt is a 24 amp 12 volt system to start. The 6bt just takes alot more to spin and get going then the 4bt and weights about 1,000 LBS and the 4bt weights 764 LBS. Plus with the VE pump on you 4bt it takes less to spin that then you P7100 on your 6bt.

 

If you have a good running ve pumped engine and a good running 7100 pumped engine, or a comon rail engine, dosen`t matter 4 cyl or 6 cyl, the VE Pumped engine will always start faster, it`s the nature of the beast. that`s been my observation. I`ve never hooked up the heater grids on my ve pumped suburban and crew cab dually 4x4, and never needed them in 17 years of hunting in colorado, montana, idaho, and utah.

 

My p7100 4bt will start in under 2 seconds of cranking, even after sitting a couple of months. Fastest starting motor I've ever seen.

 

Yeah the 4bt start up really quick comparied to its big brother 6bt and with the VE pump it only needs 3-5 HP to get going and with the P7100 it takes 10-13HP to to run. So when you have a p7100 in a 6BT its going to take alot longer and harder starts.

 

3 times the power with two more cylinders??

 

The VE has reduced timing at low rpm...the p7100 timing is fixed.if you have a cummins with initial timing at something like 10 degrees,versus something like 16 degrees,the retarded timing will promote a faster start.

the ve will advance timing with more rpm...the p7100 6bt with timing retarded lower than 10 degrees will start fast,especially cold,but won't rev past 1600 rpm or so...that same p7100 set to 16 degrees advance can be a bit of a pig to start,but will be a snappy revver.

a ve set to initial timing of 12 degrees works very well...