james j neiweem Posted November 23, 2015 Share Posted November 23, 2015 What were the major problems with the early mack v8's 864-865-866. I see a lot of these wer replaced with Cummins or inline Macks. I know one was the early fuel injection system with one plunger. It beat itself to death.864-255 HP865-Maxidyne 325 HP866-375 HP Quote Link to comment Share on other sites More sharing options...
Outbehindthebarn Posted November 23, 2015 Share Posted November 23, 2015 From what I've read on this site, lots of cracked heads....and limited parts availability Quote Fun is what they fine you for!My name is Bob Buckman sir,. . . and I hate truckers. Link to comment Share on other sites More sharing options...
Vladislav Posted November 23, 2015 Share Posted November 23, 2015 I'm not a big specialist as everybody knows and laugh but making repairs on any V8 engine requires more efforts than on in-line one. Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment Share on other sites More sharing options...
m16ty Posted November 23, 2015 Share Posted November 23, 2015 Now I say this whlie owning a E9, but I've never been a big fan of V8 diesels.More times than not, they will have a shorter stroke due to the Vee design. Shorter stroke means less torque.They are also usually harder to work on because they have more parts and the whole thing is usually stuffed in a tighter package.V8s are fine for your 350 chevys but when it comes to heavy duty diesels, I want a in-line. 2 Quote Link to comment Share on other sites More sharing options...
kscarbel2 Posted November 23, 2015 Share Posted November 23, 2015 I'm not a big specialist as everybody knows and laugh but making repairs on any V8 engine requires more efforts than on in-line one.Vlad, we feel the individual cylinder head design of our V-8 makes it far easier, faster and cheaper to service. And, the current V-8 shares many common parts with our in-line engine. Quote Link to comment Share on other sites More sharing options...
Popular Post Gmerrill0516 Posted November 23, 2015 Popular Post Share Posted November 23, 2015 As stated above, the 864 injector pump was pretty much the weak link on that engine. One distinct difference is that on an I6 engine, there is a main bearing on each side of every crank journal. This makes a short distance for the crank to flex or break across and reduces main journal stress relative to the v8. The 8's have two rod bearings between each main. The 8's have more parts as well. The in line engine is inherently a better and more robust design, to a limit. That being said, the length of the crank must limit the practical size of an inline engine. The amount of twist over the length of the crank adds up and frankly the hood gets too darn long to make a useful truck. The more compact length of the V engines lends itself to larger displacements and a short stout crank...I'm no design expert (on engines anyway) but like everything else, there are compromises and limitations in any design.Beyond that, you have to LOVE the sound of a Mack V8 running! Yeah baby! 3 Quote Link to comment Share on other sites More sharing options...
Outbehindthebarn Posted November 23, 2015 Share Posted November 23, 2015 Vlad, we feel the individual cylinder head design of our V-8 makes it far easier, faster and cheaper to service. And, the current V-8 shares many common parts with our in-line engine.Am I to understand you work for Scania? Quote Fun is what they fine you for!My name is Bob Buckman sir,. . . and I hate truckers. Link to comment Share on other sites More sharing options...
Back In Black Pulling Posted November 23, 2015 Share Posted November 23, 2015 I know unrelated to post title , when i was running my E9 on the road and it was tuned right (with all stock parts)only truck that even came close to keeping up with me on a hill was a 600 cat .I never came across any KT trucks that i know of. I know that now that you can make the others run with it that is if you want to do head gaskets every 100,000 or so.Never worked on the older 8s and very little on Mack Inlines, Sooner work on E9 then a cat any day. 2 Quote Link to comment Share on other sites More sharing options...
james j neiweem Posted November 24, 2015 Author Share Posted November 24, 2015 KS individual heads gives it away. Is there any chance of Scania V8's comming to the US for truck install? I know they are here for marine and industrial. Quote Link to comment Share on other sites More sharing options...
bbigrig Posted November 24, 2015 Share Posted November 24, 2015 Grant Haulage was given a demo with a 1000 series Mack V8 (pre E9) in an RWS in the early 80's. They ended up accepting the demo unit as there own on the condition it was repowered with an 8V92 Detroit. They were unimpressed with the pre E9 engine and never spec'ed a V8 Mack in any of there trucks considering they rarely ever hauled less then GVWR's of 100,000lbs. The E6 350 did just fine for them hauling 110-120 gross. Quote Link to comment Share on other sites More sharing options...
Vladislav Posted November 24, 2015 Share Posted November 24, 2015 Vlad, we feel the individual cylinder head design of our V-8 makes it far easier, faster and cheaper to service. And, the current V-8 shares many common parts with our in-line engine.Interesting fact that KamAZ engine was bulid originally with 8 separate heads.This desing is still in production with some modifications such as turbos and electronics.Being learned of American truck history I was surprized V8 engines were not everywhere since the most of Russian trucks starting from 60's were V8's.Keeping in mind KamAZ has his roots from Mack it's surprize the engine style is completely different. Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment Share on other sites More sharing options...
Popular Post 39 Baby Mack Posted November 24, 2015 Popular Post Share Posted November 24, 2015 Grant Haulage was given a demo with a 1000 series Mack V8 (pre E9) in an RWS in the early 80's. They ended up accepting the demo unit as there own on the condition it was repowered with an 8V92 Detroit. They were unimpressed with the pre E9 engine and never spec'ed a V8 Mack in any of there trucks considering they rarely ever hauled less then GVWR's of 100,000lbs. The E6 350 did just fine for them hauling 110-120 gross.Don't let Randy see this!RonSent from my SM-G900V using Tapatalk 3 Quote Link to comment Share on other sites More sharing options...
Freightrain Posted November 24, 2015 Share Posted November 24, 2015 I liked my Ford PSD because it sounded like a baby E9.There are lots of V8 motors making plenty of power. Personally I think it was all in the packaging and weight of the V8 compared to I6 motor. In trucking, weight is everything and if you can do the job with a lighter motor, then so be it. Bigger is always better, but sometimes it is just not practical. If everyone wanted one, they'd still be making them here.What is the weight difference between an E9 and the I6? 2 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
bbigrig Posted November 24, 2015 Share Posted November 24, 2015 2 words usually kill the argument between I6 and V8 engines. Volumetric Efficiency. I'm only referring to Factory builds not engines blown ou of proportion with add ons and programs that cut th mean engine life in half but will kill in the 1/4 mile. Quote Link to comment Share on other sites More sharing options...
ou812jk Posted November 24, 2015 Share Posted November 24, 2015 (edited) anyone know what the torque rating was on early V8s they always say its not the horsepower its the torque Edited November 24, 2015 by ou812jk Quote Link to comment Share on other sites More sharing options...
41chevy Posted November 24, 2015 Share Posted November 24, 2015 anyone know what the torque rating was on early V8s they always say its not the horsepower its the torque864 V-8 639 to 740 pounds of torque865 V-8 322 h.p. 1100 pounds torque @ 1350 rpm865C V-8 317 h.p. 1211 pounds torque @ 1350 rpm Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment Share on other sites More sharing options...
Outbehindthebarn Posted November 24, 2015 Share Posted November 24, 2015 I was looking at a '75 RL700L with a factory two stick 12 speed in it.... it also has a V8.... badge on it calls it a Maxidyne.... shouldn't it be a Thermodyne? Quote Fun is what they fine you for!My name is Bob Buckman sir,. . . and I hate truckers. Link to comment Share on other sites More sharing options...
AZB755V8 Posted November 24, 2015 Share Posted November 24, 2015 Getting back to the topic, major problems. with the old Mack v8's.864 injector pump, junk!Cracking heads, bad design with injector nozzle about 1/4 inch from the valve seats. They even had an expansion joint machined in to prevent the cracking. dropping valve seats and valves.Blowing head gaskets, They need constant re-torquing.Coolant leaking around head bolts. Freezing and hoping the head off bolt.Main bearings, need to roll in a new set about every 150K miles. Smaller than the E9 main bearings. Don't have them against the governor up a hill and let off going down the other side. Valve seats cool down and fall out if heat goes out of head to quickly.Needed more maintenance than and I6.Was a one driver engine. Don't give one to the new kid... rods out the side.. Needed warmed up good before putting a load on it.Weight, about 600 lbs more than I6.The E7 was one of the best Mack engines in al around good power, low maintenance, and durability. Don't get me wrong I love these V8's but they are not at there best most of the time for many reasons. Nothin sounds like one... Only thing as good sounding is a Supercharged 275 Cummins at full tilt... 2 Quote Link to comment Share on other sites More sharing options...
AZB755V8 Posted November 24, 2015 Share Posted November 24, 2015 I was looking at a '75 RL700L with a factory two stick 12 speed in it.... it also has a V8.... badge on it calls it a Maxidyne.... shouldn't it be a Thermodyne?Maxidyne 865 325HP 5 or 6 speed Gold colorThermodyne 866 375HP 12 or more speed Silver colorThermodyne 864 255-310HP Triplex or Quad Green/gray color Quote Link to comment Share on other sites More sharing options...
Back In Black Pulling Posted November 24, 2015 Share Posted November 24, 2015 I liked my Ford PSD because it sounded like a baby E9.There are lots of V8 motors making plenty of power. Personally I think it was all in the packaging and weight of the V8 compared to I6 motor. In trucking, weight is everything and if you can do the job with a lighter motor, then so be it. Bigger is always better, but sometimes it is just not practical. If everyone wanted one, they'd still be making them here.What is the weight difference between an E9 and the I6?E9 is 2800 Cat 3406 is 3000 dont know about Mack Inline Quote Link to comment Share on other sites More sharing options...
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