Offshoreonly.com - Another Engine Dynoed today.

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Offshoreonly.com (https://www.offshoreonly.com/forums/)

- General Q & A (https://www.offshoreonly.com/forums/general-q-20/)

- - Another Engine Dynoed today. (https://www.offshoreonly.com/forums/general-q/318637-another-engine-dynoed-today.html)

Unlimited jd

10-04-2014 06:50 AM

Have you seen what mercury uses??? If they get away with those, there's more in proper machining than anything else.

Craney

10-04-2014 08:05 AM

Quote:

Originally Posted by mike tkach (Post 4197134)

that,s me driving my cat at 120 plus mph.that was several years ago and i built the engines[950 hp 540s] but they were not dyno tested at borowski,s.at that time they were owned by someone else and although i was working there as an engine assembler i was not happy with what was going on in the dyno room so i used a different dyno facility.the problem i had was not with the dyno equipment but the dyno operator was a lazy idiot.

The guy sitting next to you looks like he's $hitting has pants!!

mike tkach

10-04-2014 08:15 AM

Quote:

Originally Posted by Craney (Post 4197280)

The guy sitting next to you looks like he's $hitting has pants!!

i told him he needed sun glasses but he said he would be ok without them.i dont think he was enjoying his first ride at 120 plus.lol.

hogie roll

10-04-2014 08:20 AM

Cool. Good job guys.

So this crew of 4 geniuses couldn't make a centrifugal blower work? :D

mike tkach

10-04-2014 08:30 AM

Quote:

Originally Posted by hogie roll (Post 4197290)

Cool. Good job guys.

So this crew of 4 geniuses couldn't make a centrifugal blower work? :D

no geniusis here,the centrifugal blower worked fine at a reasonable boost leval[12lbs] but not so good at 15 lbs on pump gas.the boat owner wanted more than physics will allow.you can not put a drag strip tuneup in a marine engine and expect it to live.hope this answered your question.

MILD THUNDER

10-04-2014 08:30 AM

Quote:

Originally Posted by hogie roll (Post 4197290)

Cool. Good job guys.

So this crew of 4 geniuses couldn't make a centrifugal blower work? :D

Oh it could have worked. But our buddy was not willing to reduce the boost level, to a reasonable PSI, for it to live. This was a carbed M4 application, that did make well over 1000HP on the dyno.

However, in the boat, it was less than stellar. Belt issues, bracket flex, blower getting so got you could fry eggs on it, lack of low end power getting on plane with a 42ft boat, and overall, it just wasnt a good combination as far as the static compression/cam combo he had. It was more suited to a roots than a centrifugal.

There is no doubt the prochargers work great when bolted on a stock EFI merc, running low boost. But imo, once you start getting up there with power levels, the whole thing takes a turn, and really needs to be thought out. And EFI is for sure the way to go there.

sutphen 30

10-04-2014 08:45 AM

[QUOTE=MILD THUNDER;4197298And EFI is for sure the way to go there.[/QUOTE]

and even then its a biotch to tune.especially if it has to run in open loop all the time.
they still make me cringe when asked to tune one.:picard1:

Payton

10-05-2014 09:44 AM

Nice job guys, cool thread.

huskyrider

10-05-2014 02:22 PM

Quote:

Originally Posted by MILD THUNDER (Post 4196989)

I loved following budmans 489 build, even though it took several years, he still posted results. Without results, its kinda just a bunch of guys trading theories all day. :

Could you or budman provide me a link to that build?
In my search I only found a thread for the intake manifold on it.
Thanks
See ya,
Kelly

SB	10-05-2014 03:01 PM

Kelly, it's about 150yrs long. Are you sure you want to read it ? LOL.

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