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down on rrrrs

 
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Joined: 06 Mar 2010
Posts: 63
Location: whitehorse yukon

PostPosted: Mon Aug 27, 2012 1:38 pm    Post subject: down on rrrrs Reply with quote

changed seals in the pump, sd 309,swapped out an alumminun aa cut with a ss aa cut imp, new wear ring, 351 redline, eagle e6, used to get 4200 wot, now only gettin 3800 wot, cleareance on impellor and pump is.o29 with one fat spacer and one thin spacer, four barrels opening up nicely and everthing seems to be workin fine? any body have an idea how to bring the rrrs back up? thnxs.
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Neutered



Joined: 15 Jun 2005
Posts: 122
Location: Peace River

PostPosted: Mon Aug 27, 2012 1:54 pm    Post subject: Reply with quote

SS impellor will pull harder but not 400 rpm, 200 maybe a bit more.
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Arthur
Outlaw Eagle Admin


Joined: 28 Oct 2006
Posts: 1654
Location: On the rocks

PostPosted: Mon Aug 27, 2012 2:05 pm    Post subject: Reply with quote

I lost close to 400rpm when I went to SS
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Tech Man



Joined: 12 Jul 2010
Posts: 46
Location: Peace River

PostPosted: Mon Aug 27, 2012 3:15 pm    Post subject: Reply with quote

I've heard of some guys lossing 400-500 RPM depending on the HP factor of the engine. Does your 351 Redline have 285 hp or is it the smaller HP engine? Personally I wouldn't worry too much. Everything else sounds good as far as specs go.
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Itsworthit



Joined: 15 Jun 2005
Posts: 432
Location: Whitecourt

PostPosted: Mon Aug 27, 2012 7:04 pm    Post subject: Reply with quote

Different makes will make a difference also
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Canadian Turbine



Joined: 02 Oct 2010
Posts: 38
Location: BC

PostPosted: Mon Aug 27, 2012 8:42 pm    Post subject: Reply with quote

I lost 100 - 200rpm with an ss.
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Medicine Man



Joined: 02 Dec 2010
Posts: 66
Location: Medicine River, AB

PostPosted: Mon Aug 27, 2012 10:03 pm    Post subject: Reply with quote

I just sold a boat with a 350 marine power engine that I think was rated at 300 hp or 280 hp, it spun a brand new Aluminum AA at 3800, according to my calculations you revs are where they should be, I think your last Impellor was cut down to an AB. It would take Apx 410 hp to spin an AA at 4200 rpm. My 421 sbc AMS motor that was 450 hp and 490 tq spun an Aluminum AA at 4500 rpm.
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