SST70 porting, how far is too far

**AUS racer** · 08-10-2015, 09:56 PM

Has anybody had any experience with how far is too far when it comes to porting and raising the ports of a stock 56ci to stt60 specs and beyond?

**powerabout** · 08-10-2015, 10:06 PM

if you are putting it on a vee bottom be careful, sst60 not great on those so I hear

**DoktorC** · 08-10-2015, 10:17 PM

Originally Posted by powerabout

if you are putting it on a vee bottom be careful, sst60 not great on those so I hear

Not great?? Not great at going slow maybe lol

**AUS racer** · 08-10-2015, 10:17 PM

Originally Posted by powerabout

if you are putting it on a vee bottom be careful, sst60 not great on those so I hear

Its not on a v bottom. This post is about porting not hulls. Please stick to the topic

**racer** · 08-11-2015, 07:41 AM

Actually hull and weight can make a difference as to what is too high on porting. I never modified an engine without knowing what it was going to be used on.

**AUS racer** · 08-11-2015, 09:49 PM

Originally Posted by racer

Actually hull and weight can make a difference as to what is too high on porting. I never modified an engine without knowing what it was going to be used on.

This is why I hate forums. Not one useful answer.

**dompie99** · 08-11-2015, 09:59 PM

I do not think that this was an UNUSEFULL answer......he was trying to give you an advice according to the item you're gonna install this MOTA on I agree with his post.

**Chaz** · 08-11-2015, 10:31 PM

Originally Posted by AUS racer

This is why I hate forums. Not one useful answer.

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 ..

**TEXAS20225** · 08-11-2015, 10:41 PM

well den how bout Dear Abby

round this neck of the woods we raise ports to 1.50 on the exhaust ports and cut all the exhaust chest out and drop the mota on a 25' center console bay-boat

**dompie99** · 08-11-2015, 10:53 PM

There is a ''sleeve company '' in the USA that gives all the measurements on all the mercs sleeves, port height, size and width.....i can,t remember the name ( old age I guess ).

This way you'd be able to find out from let's say 175hp to 250hp, what they've done to the port and this way find out how much is too much......that was my 2 cents

**powerabout** · 08-12-2015, 01:47 AM

Originally Posted by AUS racer

This is why I hate forums. Not one useful answer.

No as much as questions posted that have no answers

**AUS racer** · 08-12-2015, 01:51 AM

These motors have been mucked around with by many, there is plenty of previous posts about them. Someone surely knows the best port map for these motors

**Lil' Blue Rude** · 08-12-2015, 11:31 AM

Not to sound like a smart @$$ butt that's kind of like asking what's the best cam to put in a 350 chevy and not knowing what it's for. They've been around a long time, there's a lot of different cams but what works best for a pulling truck probably won't be the best for a road race car. Same thing with the boats a heavy setup boat is going to need a different prop then a light setup boat so that means the heavy boat might need more torque at X rpm so the port map that worked on the light setup might not make enough torque to plane the quickly or at all or vise versa a port map for a heavy boat might make a light boat launch out of the hole but fall flat on it's face at higher rpms. That's not even getting in to difference in the drag and area of a different hulls or gear ratio's in different lower units.

**LittleCharger** · 08-12-2015, 12:36 PM

Originally Posted by AUS racer

This is why I hate forums. Not one useful answer.

Your telling me guys with 2,500 and 4,000 posts that have tons of knowledge are posting useless posts...The last question you were posting back in July was how to remove a 70hp powerhead!!! Go luck with the porting.

**dompie99** · 08-12-2015, 04:55 PM

Wowww, for a shear, it,s a major one.

let me picture a few things of my own. I've posted pictures that must have been ''silly', to some but very straight to the point for ME and may be for others. This being said. there is NO silly questions whatsoever.

Knowledge is something that, unfortunately, will fade away in your brain once you stop breathing. You will take it away with you in the grave. It's perfectly honest to share it and it,s also perfectly good if you don't want to share it with the ones in need. This globe of ours is populated with @$$ Holes from every country, every nations and mostly every size, length and all those combinations as above stated. I've met my fair share of that type of so called human beings as an TV Broadcast electronic engineer and thank God I did not loose faith in the better. I had so much fun teaching things I've learned the hard way and, after a few years, seeing this '' KID'' doing things in the best way that I would have done and sometimes better than me, That brought confidence in the new generations to my soul.

It would be so much fun If we,d decide to set aside those frustrations of the day ( there was a few for me in the past weeks ), enjoy this sport/hobby of BOATING together and help each other to a better cruise on those rivers all across the world.

May be i am day dreaming, but you should hear what my brain was telling me to write about the last few posts that I did not typed, I could have been banned from this site for a loooong time. thank God.

https://www.facebook.com/Crazyonesof...42916/?fref=nf