SST70 porting, how far is too far

[TEXAS20225]

Your question cannot have a answer because its too vague specific things are for specific things

[eli]

its too far when you grind all the way thru and see daylight ,where is my welder lol

[R.grover]

Chaz mate he just wants a 100mph out of it just tell his what to do would ya lol
Nos and lots of it maybe?

There is a lot more to "porting" than just roof height's . But if that is your major concern , how many degree's ATDC does the Ex , transfer and boost port's open .. ?
Impossible to form a map without baseline numbers ..

[phillnjack]

Well I can see where aus racer is coming from. none of you have answered his original post.
from what I read all he wanted to know was can he take his ports to same as the sst60 engine ?. yes or no !!

BUT from what I remember of AUS RACER he forgot to mention he has a oval port 56 cu in block the same as mine.
Now the sst60 oval port and the sst60 bridge port are two totally different blocks.
unless he has changed motors that is.

when OMC made the SST60 engine they never knew what boat it would be put on, they just made a powerful race engine.
so knowing what boat its going on is realy not relevant.

please can everyone also take note
that Usa, Australia,Canada and England have very different ways of reading stuff and interpreting each others posts.
we might right something that looks like an insult, but is not always meant that way. !!!
we all have strange sayings and ways that can offend others.

[Chaz]

Mate , the dogs bollocks of a lump you quip ....

No actually , he asked : "sst 70 porting , How far is too far"

The answer to that question was as Eli said ... When you see daylight .

When the intent is to improve on a strong motor . It helps to know what type of hull and aprox weight it's going to be pushing around.

It's mandatory to know :

Bore
Stroke
Rod length
Ex opening ATDC
Area of Ex port
Ex port/ bore %
Transfer opening ATDC
Boost port opening ATDC
Combined T/B area .........

If your serious about this , then there are some specialized tools your going to need. Some for measuring , some for marking and the rest to remove stock and smooth what's left. A good 90% hand piece is invaluable as well ...

There's always ...>
Me an ol Billie Bob we got us a a few pints and some rat tail files , hard ta remember , but I reckon we filed them ports good cuz that boat run fast. Well once it finally got up on plane ... mite coulda went tooooo ferrrrrrrr ...

Or you could even do as Rick says , and pill it - till ya kill it ...

[powerabout]

when OMC made the SST60 engine they never knew what boat it would be put on, they just made a powerful race engine.
so knowing what boat its going on is realy not relevant.

.

I'll think you find OMC knew exactly what class hull they were designed for and that class still exists and you'll never guess what its called....SST60!

[olboatman]

I'll think you find OMC knew exactly what class hull they were designed for and that class still exists and you'll never guess what its called....SST60!

Wise guy!!! Gary

[powerabout]

I would say since the 70's OMC knew exactly what boat/class every race engine they made was going on.
The sst45 is the only one I can think of that ended up on a different design other than that for which the engine was designed for.
Sound about right?

[phillnjack]

not all sst60 engines were going to be purely raced on particular hulls, a lot of the sst60 class hulls have different designs.
Fair amount of difference in makes,shapes etc.
for example . V hulls, cats, tri hulls .... all totally different and all have used sst60 engines.

nobody even noticed he asked sst70 !!! he obviously meant 60 !!

[racer]

I was at the factory when original SST60's were being built and tested, they were built/designed to run on single seat full tunnel race boats. They were sold as a race engine. Hulls outside this have seen the engines but that was not the original intent.

Also Phil if you really think knowing the weight/hull design/intended use has no baring on how an engine is built/ported you a sadly mistaken.

[Chaz]

nobody even noticed he asked sst70 !!! he obviously meant 60 !!

Post #20

Second sentence ...

Back to your regularly scheduled .... well better not say

[phillnjack]

nice smarmy try chaz , you need to get up a bit earlier.

[MN4V]

I have seen a SST-60 tunnel with a modified SST-60 motor on it before. It had the old Mod 50 intake with the three double throat carbs and with porting. Supposedly it made big power, but was not much faster than a stock (blueprinted) motor. The comparison was easy because both boats were the same and both drivers were the top competitors in the class. To me, it seemed the Mod motor must have been tuned for a higher RPM and it didn't work with the available propellers. Cool motor though! Right now a blueprinted SST-60 motor can come close to 100 hp, some get a little more. These are dyno figures too.
If you want a motor built, go to Mike Wienandt at http://www.wptracing.com/
Mark N