Tech specs of late inlines.

[petlun]

Speaking of 1972 1400´s and 73 and later 1500´s, my guess (at least for the moment) is port maps were the same, but with the Power Port added in the 1500. I suspect even the 1970 - 71 1350 had the same porting and if this would be correct, it means even the 1970 - 72 1150 blocks should be the same.

But hp difference between a 72 1400 and a 73 1500 also came from new "banjo style" reeds in the 1500.

[milkdud]

Are you talking the early 1400's or the late 1400's?

I have a 1980 1400 apart and it looks a lot like the 1975 1500 I have. It does have low dome 3 ring power port pistons tho...... It also is set up for ADI ignition. So not place to mount a Distributor.

I plan on putting high dome pistons in this 1400 along with some other touch ups to see if it will perform like my 1500 xs.
Conrad

[T2x]

I will check years with Serial #'s. I gave two powerheads to a friend, a 140 and a 150. He would like to have 2 150's and we discussed what is involved in bringing the 140 up in power.

Thanks,

[petlun]

A 1972 1400 is definitely an early 1400. The 1400 designation came back for 1978 (but for actually the same engines as the 73 - 77 1500´s) and was rebadged 140 for 1979 - 80.

In 1981 the 140 inlines (same as 73 to 80 1500/1400/140´s) were replaced by propshaft hp (almost!) 115´s.

[milkdud]

side bar.....

Does anybody know the difference between a 140 block and a 150 block (non xs) ?

Petlun, Above is why I was asking. I didnt know if he knew which one he had.
Conrad

[milkdud]

I think the newer reeds came sooner than the 1973 1500. Im pretty sure my 1350 has them.
Conrad

[Mark75H]

Not necessary a disbeliever, but when I look at the upper port in your first picture I would say it looks very much like a mill has been applied in only one direction there. The low position (to the right in the pics) of the port in combination with the mill diameter chosen (size of ports), makes it eat a bit into the aluminum of the transfer opening though.

But maybe I am just fooled by the angle of view. What would it look like with a drill bit of proper size pushed into position in the "primary hole/channel"? If done I guess the result of the secondary machining would be clearly exposed.

I took that first picture to show how straight in the tool went; pretty much showing it had to be a mill bit. The second picture is the same cylinder from a different angle.

Here are some more angles of the same cylinder as above. Looking at larger views of the XS, it has the same kind of second angle cut, just less pronounced. That is why I predict this can not be done with hand tools. I agree, there must be some fairly dramatic results from this or Merc would not have done a second machining operation. Every step left out is money saved, to add in a operation means it is really required for some result.





I would also like to see a second and third XS apart for measurement and inspection ...
280

[Mark75H]

to add in a operation means it is really required for some result.

But exactly what that result is would be unknown to us without specific information. It could be a power increase, it could be a fuel economy increase, it could be a detonation resistance improvement, it could be something else or a combination.

[baldad45]

Are you sure there are more than one cut per port ? On a 115 block I have apart a 7/16 bit fills all the spaces ,the contours of the transfer passage makes the one cut look like two .What year is that block ? It appears to be cut a little lower than mine .

[Mark75H]

I see what you are saying. I'll check the serial number for the year of this one. What's the serial number/year of yours?

The height in the window is not as important as the measurement from the split.

[baldad45]

The serial # is 7075637 ,block casting # 852-6067 2, I think it's a 1977. The casting # on my T-ll is the same.

[petlun]

Milkdud:

I think the newer reeds came sooner than the 1973 1500. Im pretty sure my 1350 has them.
Conrad

I think the late style inline reed blocks may have appeared already in the 1968 1250. But the banjo shaped membranes with the slightly modified stops were first used in the 73 1500 I´m pretty sure.

There is a patent paper from Mercury with Ron Anderson as "Inventor" on the banjo reeds and stops, filed August 1972. In the paper the Merc 1400 is referred to when presenting the results and as the type of engine used during developement. The banjo reeds gave hp results very close to .007" thick membranes, but with a much better reliability and lifespan. (Ordinary production membranes, std and banjos, are .008".)

baldad45:

Are you sure there are more than one cut per port ? On a 115 block I have apart a 7/16 bit fills all the spaces ,the contours of the transfer passage makes the one cut look like two .What year is that block ? It appears to be cut a little lower than mine .

My curiosity too.

I will probably go to the cottage for winter closing this weekend (I understand some people are having a nice meeting in far away Florida this same weekend). I have a bare 1988 115 block in a closet there (instead of a skeleton). I will take one 11 mm drill bit (close to 7/16") and the camera etc and go hunting for some would be traces of secondary transfer ports machinings.

PL

[baldad45]

Your 1988 115 block will be like the earlier 140-150 blocks and have larger ports ,also placed higher .Will you post the patent paper on the banjo reeds ? You are right about the reed blocks being the same as the 68-69 1250SS.

[petlun]

I will post two papers on reeds after this weekend, one on the reedblocks 68 up and also the one on the banjo´s. But I need to scan them (pdf doesen´t work for some reason) which takes me a little while.

My idea to check on my block at the cottage was beacause it´s available there, while my 84 powerhead is on my boat. Do you mean your 115 has the lower more restrictive ports like Mk75H´s 115 in his pictures? If so, I should look for some fatter drillbits ?

[Mark75H]

Yes around 1983 Merc changed to prop shaft power rating. The 88 115 resembles the 140/150 - the 88 90 is like the earlier 115