Offshore style engine mount
 

So, I noticed what appeared to be a crack or delamination on one of my motor mount pods earlier this year. I had been watching it and hadn’t seen any real changes, so we were going to let it go and wait to see if it got worse. Well this last weekend we were able to steal a beautiful day on the St Croix River and in the process the boat ended up getting a little hammered. On a cruise around a wider part of the river, the boat just got hammered by upriver wind waves and big cruiser waves, so we headed back to the beach.

Yesterday, I had the hatch back and was looking around in the bilge and saw that mu motor mount had collapsed into the motor pod and the other side was now cracked. So the waves did me in good. Getting ready to pull the motor and derig so I can fix it, but should I go back in with pods / mounts that are just tied into the stringer, or should I go with an “offshore style” mount plate that ties the two stringers together?

Ultimately, I would like to know main benefits of using a motor cradle offshore style mount. And I’m pretty sure I know the answer to this question, but is there any problem using an offshore mount that is specified for a BBC on a SBC? The motor mounts are in the same spot with respect to the bellhousing so I wouldn’t think there would be a problem, unless the mount point is wider on a BBC.

sounds like your stringers are rotted out, added the offshore mounts may or may not help, but working on rotted stringers is not good as you do not know how far the rot extends. the offshore mount use a long steel angle that runes the entire length of the engine at least, with a cradle under, or at least mine does. the motor mount placement is not the same on a big block vs small block either. You need to get in there and find out how bad the stringers are first..my .02

pictures please, then we can help.

The offshore mount is far superior as it ties the stringers together and there are no cheap a$$ L brackets with junk rubber mounts. Find a used one in the swap shop.

PM me and I'll send pics of a Scarab we fixed this year

i put an offshore mount in when I re-rigged in 04, it is still solid and drive slides in easily. Takes time to get perfect alignment first time, it does restrict access under the motor which can be a pain.

Last year I had to replace the outer transom assembly and decided to replace the rubber bushings that are the rear motor mount in the inner transom assy, just because it was out. That did make it tight getting the drive back in though it has eased up now. I probably should have left that alone and now wonder if anyone replaces these with something solid when going with an off shore mount setup. I kept them thinking it would allow for minor miss-alignment or settling.

Thanks for the info guys. I've been told by a manufactures rep that the stringers in my boat are fiberglass. I'll get some pics, but am not by the boat for a couple of days. The mount pods on the Stingray have no wood in them; they appear all fiberglass.

I see mounts for BBC but none for single sbc installations. I suppose I can always cut the motor mount post off of a BBC mount and move it out to mate up where the sbc mount is.

Pretty sure the stingrays are notorious for rot. I would fix that issue before anything else, if in fact that is the case.

yep...the checks in the mail...you know the others !!!!!! probably no wood in there now !!!! the $hits rotted out...

[IMG]http://i1243.photobucket.com/albums/...t/100_0920.jpg[/IMG]

[IMG]http://i1243.photobucket.com/albums/...t/100_0919.jpg[/IMG]

Long time no see , hows the build coming? Well, I hope and great to see you back!

Just got the engine back after six months . Dyno says 854.6 hp @ 6000 rpm 91 octane fuel . [ATTACH=CONFIG]546608[/ATTACH]

that sure is a shiny blower.:party-smiley-048:

Nice ! Hope there's many trouble free boating seasons ahead.

Heres an example of rotten stringers[ATTACH=CONFIG]546610[/ATTACH][ATTACH=CONFIG]546611[/ATTACH][ATTACH=CONFIG]546612[/ATTACH][ATTACH=CONFIG]546613[/ATTACH]

Heres the fix[ATTACH=CONFIG]546614[/ATTACH][ATTACH=CONFIG]546615[/ATTACH] The Owner wanted to do a partial repair on one side only so he didnt lose the rest of the season.

FINISHED PRODUCT

[ATTACH=CONFIG]546616[/ATTACH]

The offshore mount was bent from the motor flopping around prior to the new glass work

my offshore mounts do not look anything like either of these...I have a big angle steel that runs the full length of the engine with the engine mounts welded to it and a simuilar bar as these running under the oil pan

Engine looks great. How much boost did you end up with what pulley combo?

You should start a build thread.

Yea , I don't want to hijack so I'll start a thread later on towards winter . Pulley combo is 56 bottom and 51 top . 7.5 - 8lb boost . Thanks go out to Mike Tkach for hitting the combo exactly . That's what roots blower experience will do !

that is what a lucky guess from a back yard hack will do!

Not sure what you do for a living,but you're surely no hack!

i must be a hack,i don,t have a website and i don,t post on 20 forum,s,lol.