Monza head on a Scrambler

[amartina75]

If all things were left stock on a 66 scrambler and it had a Monza head and piston put on it, what would you have to do or change to make it run right?
66 scrambler: 28w mag, ss27 carb, 18deg advance mech.

[ecurbruce]

What size scrambler engine...
What size monza head???

[amartina75]

66 250 scrambler: straight pipe, 18 deg advance unit, 28w mag. ssI27d carb, 28mm intake port
250 monza head from engine #86687, 25mm intake port

[DewCatTea-Bob]

" If all things were left stock on a 66 scrambler and it had a Monza head and piston put on it, what would you have to do or change to make it run right? "

____ Nothing at all, as it should run pretty-much the same as a stock-Scrambler !
BTW, the 250Monza-head should have an intake-port dia.size of 26.5mm ! _ So it's fine just as-is to run with the 27mm Scr.carb.
If your 250-head's intake-port really is only just "25mm", then it must be a pre-66 250GT-head.


Duke-Cheers,
-Bob

[joe46ho]

Bob, we are unsure of the year of this engine, but the serial # is posted (not that it helps that much)
The answer may be somewhat the same, but a more accurate question would be about putting the entire monza engine into the 66 scr, and fitting it with all the scr electrics, aa367b advance unit, and 28w charging system, and ss127d carb of course... I think its more a question of would you need to tune it any different, since the monza didnt come with the 28w batteryless ignition, or the aa367b advance unit, or the ss127d carb.

This is all assuming we are running the stock violet cam, monza piston, stock size monza valves,etc... and the ONLY things being changed are the advance unit, ignition coil/electrics/charging system, and the carb. It seems the carb would need re-tuned no doubt...but is that all ?

Joe

[DewCatTea-Bob]

" we are unsure of the year of this engine, but the serial # is posted "

____ Off-hand, I'd guess that motor-number starting with 86 would make it a late 4-speed or early 5-speed from 1963 or early-64.



" The answer may be somewhat the same, but a more accurate question would be about putting the entire monza engine into the 66 scr, and fitting it with all the scr electrics, aa367b advance unit, and 28w charging system, and ss127d carb of course... "

____ You're right, what you'd then have is pretty-much just a Scrambler type motor with Monza-head & piston.



" I think its more a question of would you need to tune it any different, since the monza didnt come with the 28w batteryless ignition, or the aa367b advance unit, or the ss127d carb.
This is all assuming we are running the stock violet cam, monza piston, stock size monza valves,etc... and the ONLY things being changed are the advance unit, ignition coil/electrics/charging system, and the carb. It seems the carb would need re-tuned no doubt...but is that all ? "

____ This reminds me that back in 1978 I had done the exact same thing ! - I took a rebuilt 1965 Monza-engine and put it into a perfect 1966 Scrambler (and sold it that way for just 300-bucks!). _ However I hadn't bothered with changing the alternator, but did retain the non-battery et.type of ign.system.
It ran quite fine with either the Monza or Scr type carbs ! ...
__ The compression-ratio & camshaft changes really make no difference for the carb.tuning, (unless you care to get caught-up in minor-fractions of HPs with extensively-detailed dyno.testing).
You-fellas combo-project should work well & straight-forward without any hitches to be concerned with !


Duke-Cheers,
-Bob

[amartina75]

Thanks Bob,
The head does measure about 25.5mm at the intake port so I guess it is from a 250GT. I will double check that when I take it apart.
I plan on taking it apart sometime in the next few days. I will get some more measurments and pictures then.