300+ rebuild

[mechohaulic]

6 hours ago, Freightrain said:

I've run valves, so I understand the procedure.  On my hot rods, I always do one cyl at a time.  They have cheat sheets on how to do multiple cylinders at a time but I never do it that way.  Ever.  Even after getting grief for it.  "Oh, you're taking too long".  Whatever.

This having so much lash surprised me.  Why does it require so much for a "dynatard" cam?  What is special about it?  I'm just glad it isn't a cam lobe problem.

I did the valves on my 237 and the Jakes without issues.  I know Jakes are different but I followed the sequence and they work fine.

I want to transfer the Jakes over to this engine, if possible.

one day if time allows. do the cheat sheet method of adjustment ; then go back to one cyl at a time see if any difference.  the better jacobs is an add on with jake unit holding down exhaust valves AT PRECISE cyl firing. the dynatard being built in has those over sized rocker adjusters which are simply small hyd slave cyl. that combined to a screwy cam make the Daynard "work". the dyna has to be on cyl TDC  for proper adjust. pushing down on rocker to completely expel all oil in slave cyl. short version the dyna ain't worth sh- - t ;makes some noise.  fred flintstones car had better braking. 

[fjh]

7 minutes ago, mechohaulic said:

one day if time allows. do the cheat sheet method of adjustment ; then go back to one cyl at a time see if any difference.  the better jacobs is an add on with jake unit holding down exhaust valves AT PRECISE cyl firing. the dynatard being built in has those over sized rocker adjusters which are simply small hyd slave cyl. that combined to a screwy cam make the Daynard "work". the dyna has to be on cyl TDC  for proper adjust. pushing down on rocker to completely expel all oil in slave cyl. short version the dyna ain't worth sh- - t ;makes some noise.  fred flintstones car had better braking. 

Yup yup a fart in the wind has better holding power!😂

[Geoff Weeks]

4 minutes ago, mechohaulic said:

one day if time allows. do the cheat sheet method of adjustment ; then go back to one cyl at a time see if any difference.  the better jacobs is an add on with jake unit holding down exhaust valves AT PRECISE cyl firing. t

That is only true for engine that use a rocker to work the injector. Engines with an injection pump (mech Cat and Mack) there isn't the rocker to trip the the exh valve at injection. So on those they have to use a valve on an adjacent cyl to trip and the timing isn't exactly right. It is why a mechanical Cat's Jake isn't as good as one on a Cummins. Once mfg went to electronic common rail with the cam pushing the injector and the electronics adjusting timing an duration, Jakes  matched those of Cummins. 2 stroke Detroits had there own problems, keeping a Jake on those limited.

[Freightrain]

3 hours ago, terry said:

Larry , i might have missed it, gonna run the triplex behind it?   Terry

My initial thought is NO.  Everyone says to but I don't want to worry about something going wrong.  These transmissions arent on every block anymore. 

 

My next thought is get rid of the 4.10s for a set of 3.55s if I can find a set for a Rockwell.  Then I can run a 13 spd.  If changing rear gears becomes a hassle, I want a true double over 13.  Not a homemade version.  I want more road speed at lower rpm(noise level).

I will be removing the little 6041 box I have hanging in there.  Much to fragile.(I'm a gearhead, I want something I don't have to drive like I have an egg under my foot).

I had thought of using the 5 spd that came with engine and find a 1241 and use it for splits, plus if I get a 1241C it has deep under like my 6041.

 

Lots of "maybes" and "ifs".

[Mark T]

4.10s and a 15 over. Used to work nice with a 300. And one of those shouldn't cost a fortune.  Good luck finding an RTOO thirteen. A RTLO 13 or 18 has a high final overdrive, and some of the smaller series don't cost a whole lot.  A direct 5 speed and a 1241 with 4.10s....might just as well use an RTO 13. Even a  FRO 10 would be nice with 4.10s. 

[davehummell]

Larry I have a freightliner air ride axle with a 373 ratio and I put in a 13 double over triplex I bought it not knowing it was a double over the junkyard guy just said it was a triplex it will go faster than I really want to drive anymore

[Freightrain]

I want to cruise at 14-1500 rpm @ 65 mph.  Not 1800 I am now.  Those 3.55s or a double OD like I basically have using that 6041 box.

 

I'm not worried about going fast, just fast enough without all the noise.

[Mark T]

FRO

[Geoff Weeks]

I wouldn't have a 15 in anything if I had a say. I have one in my Marmon and hate it.  If gearing for slow RPM at high road speed, steps between gears are critical to having something that works well.

If using an Eaton, then look are rear gearing and transmission as a package. What you choose in the axle will effect if you want a RTO or an RTLO 13 or 18

My use was different than your, a lot more weight and wind resistance, but also a lot more displacement at power (ATA 3406). Being able to drop a gear and gain ~250 rpm vs ~400 rpm is the difference between a 13 and 15. I know right now you are thinking "I'm going up in HP I will not need to drop a gear" but there will be times you will and going to 1650-1700 is a lot better than 1900!

 I still say what you have will handle what you are putting through it, I wouldn't put a driver in it, but driving it yourself it would take it just fine.

[BOBWhite]

I've never seen a 15 speed in anything but old oilfield stuff and haven't ever driven one. I can see why 15 speeds fell out of favor, same with super 10s.