Macktruckman

I’m a little late to the party but I have done basically this last winter. I pulled out an EM6-285 2 valve that finally gave up. I bought an E7 that started life as a 400 VMAC with the Bosch pump and electronic governer housing and throttle control. I did not use that pump but now i wonder if i should have. But that’s another story. Anyway, started with the steel top 15.3 compression pistons. Scrounged up a mechanical P-7000 series pump. Sent the pump and stock injectors to Antrim diesel in PA. These people are top notch. Absolutely amazing service and communication. Using some dyno sheets and specs from engines and trucks they had previously done up, they built the pump, and injectors and matched a S-475 type turbo. It was not cheap. Had to have new larger plunger and barrel sets and delivery valves. I had them do completely away with the aneroid valve and put a cover plate in its place. Used 3,000 rpm governor springs for the dodge/5.9 p7100. (They ran it on the stand and said it will probably govern the mack engine to about 2500 rpm. I dont know as I dont push it that hard) Injector nozzles are a 427 that’s approximately 20% over. I spill timed it at right around 20.5-21° btdc. It has not been on a dyno. They estimate judging by previous data of almost identical setups that it should be in the neighborhood of 475hp to the ground. They figure around 550-570 hp at the flywheel and 1800 ft lb of torque, give or take. I put a new genuine eaton 2050 clutch in it while it was apart. It is a very different truck. Its a 1978 R685. It has mack 4.17 rears and i took the old 2 stick 107 six speed out years before and put in an eaton 9LL. RTO14909MLL to be exact. It pulls very hard… the harder you mash the throttle the louder it gets and faster it goes. Lol…and it will turn the sky black if you want it to but it’s actually not terribly smoky if you drive it right and I usually go pretty easy on it. They told me it would probably have a dirty, smoky idle, and it does. Some things I think need to be noted are 1: Im the only driver. Ever. 2: It will absolutely get exhaust temps high very easily. Have to pay attention and respect it. 3: it will probably not see close to 500,000 miles in the rest of its lifetime nor mine. i dont think it would live long with just any driver in it. It probably wouldn’t live too long with anyone. I did it this way anyway because I knew it would be a low mileage very local truck. There are too many names here to name them all but i have had tons of good real world advice and knowledge from folks on this site. JoJo and terry and freightrain. Just to name a few. And sure miss Glen Akers. I don’t know much but maybe what little experience I can offer will help someone. Josh

Its been a slow process but I have replaced my EM6-285 with a E7-400. The E7-400 was a vmac and i converted it to full mechanical bosch P7100 type pump. Antrim built the pump and turned it up a bit and changed the governor springs so it will turn 21-2200 rpm instead of limited to the 1800. Also bought new injectors with an approximate 20% over nozzle. Upgraded turbo to the s475 style. My question is where to set the injection timing. I have it spill timed at right about 20°-20.5° advance the best i can tell. Does anyone know if i need more? Or less? Or sounds about right. Runs alot stronger than the em6 and makes around 35lbs of boost in a pull with a good load. I’m getting a bit of light colored smoke at idle and low rpm no load. Black to a gray haze in the throttle or heavy loaded. The black to gray looks normal to me the light i don’t know about. Water temps stay 170-180. Exhaust temps stay good. They will climb pretty quickly if you try to lug it hard loaded. Downshifting or backing off the go peddle drops the exhaust temps right back off. Hottest i have let it get is about 1000 or so for a second or two at a time. My main question is if my timing sounds right to everyone. Thank you Josh

Did you ever decide on a timing setting and how does it run?

The early full mechanical E7-400 injection timing is 19° advance factory. The VMAC 400 is 6°. Im doing the same thing. EM6 finally laid down and I bought a 95 E7-400 VMAC and then a mechanical pump and had antrim build the pump and im in the process of getting it back together. I spill timed mine yesterday at 20°. Josh

Lol. I always seem to scrape together just enough to make it somehow. And im jealous btw, i love the look of cruiseliners. josh

Thank you for the heads up. I was able to find a core mechanical E7 pump and its at antrim now getting new 400 plungers and barrels and complete work over to match a turbo and injectors they sold me. Now if I can find the injector lines and figure out how to pay for it all. Lol. josh

Well i made the switch to mechanical because I put the vmac 400 in an old 1978 R-685. So i didn’t have any of the electronics or the throttle pedal assembly and wiring harness. But it turned out to not be quite as simple as I had anticipated. I wound up having to do away with the econovance all together. I thought I would be able to leave it and use my old EM6-285 pump. But I wound up having to hunt down a full mechanical E7 pump and it’s currently at antrim diesel being rebuilt. By doing away with the econovance you also have to buy new injector lines because the injector pump will now bolt several inches foward directly into the back of the gear case. The lines can be purchased PAI makes them. Unfortunately they only want to sell them in packages of two lines per part number and package. So you have to two of each of the 6 lines you need. It’s stupid. You will wind up with 2 full sets of lines for double the price. Lol. I would sell my E7-400 VMAC injection pump and the econovance and injection lines. Was all running i just needed to switch to mechanical for use in the old truck. Josh

Thank you heinz I called them and they do in fact offer the one for the early E7-400 as well. The cost plus a 1200 dollar core charge because I don’t have a core to send in. So I am still in search. Thank you again. Josh

Happy thanksgiving

How have you been doing?

I see the april now. All E6 pumps. Thank you though joey

The October one is a partial electric vmac pump. I am not seeing the April

I need a 7000 series (P7100) numbers would be 0 402 746 852 PES6P120A720R57157 thank you Josh

Hi joey. No my old 3000 series robert bosch cant make enough to feed a 400 plus hp engine. Im surfing the for sale section now.

Well my old E6 pump wont work so if anyone has any leads on a full mechanical pump for a E7-400 id love to hear. Thank you josh