Found this the other day, may have come from this site. I know less HP motor but still interesting exhaust test. Coming from the Bike/Car world we have always been big on exhaust tuning. What goes in has to come out.

Anyway as for the maybe other issue, that sucks. At least you should be good at pulling your motors Tim:(

Better than 15!!!.... Good luck!

That is Mercury's R&D department.

Wonder what would have more to see. Marine kinetics R&D department, or Mercury Marine's. My guess is multi million dollar operation, might be a bit more advanced, than a kitchen table, a laptop, and sitting in on a seminar once a year at PRI.

Bob used to love bashing mercury engines to me on the phone. Sorry, but 90 percent of people who have mercury power, are out boating. Not spending weeks on the dyno trying to figure out why their drop shipped parts combo isnt making the power it should. Or , if they do make it into the boat, its a crap shoot if its gonna stay together for 100 hours.

So what was wrong with the 565s that were in the B!tchtress originally?

Tim, I sure hope u get this solved sooner than later... This stuff is gonna make you an old man quick:daz:

Oh I know dude... Hence why were were drinking beer talking about our chitty engines last night lol

[ATTACH=CONFIG]559909[/ATTACH]

I hate it when that happens. Makes a hell of a mess in the bildge.

Sure does....

Not sticking up for him but when I've worked with him on combo's he has always asked me what parts I use, especially exhaust. We've reviewed combos for intake restricted engines and exhaust restricted systems. In a recent build, the exhaust was scrapped because the larger cam wouldn't have benefited from the small exhaust.

Maybe the limitations were reviewed, maybe not. I wasn't on the call when it was spec'd. :-)

I saw it when I had solid rollers. Lash tightened up about 5-7 thou after the first season or so. Lift was .636 solid, tight lash roller, about 190 on the seat. Crane Grind

I wouldn't worry to much about the seats at this point til you pull heads and confirm which is basically what I was hearing you say in earlier post. I agree. In regards to head issues I've had them myself with Dart. At least your AFR's bolted up. I've had darts that I actually had to put on the drill press and drill a few holes 2 drill bit sizes larger and still couldn't get all the bolts in. Had to send 2 heads out of 4 back to dart finally for replacement. And yes that was after hours of porting and blending and complete assembly.

I will have to ck to see valako is doing for routine maintenance on his heads and what he's using for seats cause he's got to be slamming the living dog chit out them. Hyd roller with duration close to 741 cam and 708 lift with 1.8's and solid lifters and springs to boot. You'd think he'd be yanking his heads at least every 25 hours but seems be reliable. Maybe it's the extra spring pressure that is actually helping rather than hurting as the lifters aren't lofting off the lobes and slamming. Just a guess...

Yep never told Bob what exhaust I was running or target HP....

Says dominators here but after the fact we discovered zero clearance, I can search for them emails also if needed... But you guys keep trying to pin this as all my fault... I ask you to spend the coin then have to keep tearing engines apart after... See how it feels... Bob may have done good for you guys... But clearly not for me, and I have backed up all issues with proven paperwork and such... That's what kills me lol

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Since u have some experience drilling cylinder heads and it seems as though you are trying to get everything you can out of a pair of 565's there is horsepower to be had shifting the head on the bore. It is a lot of work but it is there.

Not surprising....nice lobes he has.

Tim's???

Looks like a cast cam

Yep.

Omfg Bob.... You mother!

Who's got the "agenda" ?? Hmm looks like MT and all of us bob haters are proving you cheerleaders wrong huh? How you Gus gonna make this part my fault!!??? Let's hear it... Boy am I lit right now!!

Looks like several other MK cams that were removed from engines after a short time.

Maybe ground thru the hardening ?

God forbid you say hey maybe Bob screwed up. What makes him so god like? Just curious why some of you deem him untouchable and he can't make mistakes.

I had a motor swallow a lifter this summer and it's lobe doesn't look that bad:angry-smiley-038: I still replaced the cam and lifters but man, that sucks for ya

I never deemed anyone untouchable nor did I make anyone seem god like.

Maybe we found his missing horsepower:lolhit::thankyouthankyou::party-smiley-004::poopoo:

Are you there at Tim's ?

I can't see extent of mark in my computer. How bad is it ?

I remove and install cams all the time and I can tell you that doesn't resemble an 8620 billet cam at all.

Port engine I bet.

My guess is both will look the same. This isn't an anomaly or the first one like this. Quite common actually.

Thats the LS firing order cam he got from Bob Madera. Heres another one of bobs cams that was pulled out of an engine with 35 hours. looks like 8620 cam to me.

What would it matter what side?:confused:

I think that is normal MK cam wear Tim.
Heads and Cam have to be tuned up every season. Try some 800 grit.

This is a Marine Kinetics cam after 35 hours, see normal.


http://33outlaw.zenfolio.com/img/s7/...92972445-5.jpg


Dammit Joe beat me to it.

Thought it might be why he had to lean that side down. Wasn't getting as much duration. :faint2:

I'd confirm 100 % seat and open pressures all good and no coil bind. Then probably making a phone call or going for a drive with cams in hand.

My crower cams or your crane 8620 billets didn't look like those, and they've been around the block quite a few times.

That is definately 8620

I'd hate to see his lobes if he was spinning more than 5400rpm.

Obviously you want to cover all avenues. However this not being the first or an abnormal ordeal kinda lends to what the issue is.

Right looks like Tim's is a 5150 which is a cheaper core.

http://33outlaw.zenfolio.com/img/s3/...51089156-3.jpg

Mine have a little mark. Can you feel anything with your finger Tim or are you too busy kicking the dog and throwing tools??

It`s probably not even A Marine Kinetics Cam.
Tim!!????!? WTF!?