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37 Briggs EFI Heads - 2 years since introduction - review?
http://mudmotortalk.com/mmt_v2/viewtopic.php?f=3&t=70148		 Page 1 of 1
Author:  TGunn [ Tue Mar 28, 2017 6:49 am ]
Post subject:  37 Briggs EFI Heads - 2 years since introduction - review?
Back in early 2015, the 37 EFI was introduced. At that time, we were told that the heads had a different part number from the often-maligned 35 heads that everyone complained about leaking valves on.

I would *assume* that the vast majority of 37EFI owners---PD, GTR, and MB---have not modded their EFIs with heads/tune. So what's the opinion on the "new" (if they are any different?) heads? Two years in should be enough time to tell if the heads are any different or better, right?
Author:  cb5331 [ Tue Mar 28, 2017 7:13 am ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
Still made by briggs. Still leak.
Author:  3rd Coast Killer [ Tue Mar 28, 2017 7:17 am ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
Author:  MaXXis85 [ Tue Mar 28, 2017 7:34 am ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
The only difference is the intake valve is .020 larger on the EFI. Same stuff different day!
Author:  SETx Longtail [ Tue Mar 28, 2017 8:09 am ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
Still Chinese lowest bidder garbage. With a fancy way to squirt the gas in there...
Author:  TGunn [ Tue Mar 28, 2017 8:37 am ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
Fair enough.

Any owners here of 37EFIs that have exhibited leaking valves since 2015?

Maxxis, you work on them, correct? What have you seen?
Author:  cb5331 [ Tue Mar 28, 2017 8:42 am ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
Same shit, same problems man.
Author:  MaXXis85 [ Tue Mar 28, 2017 8:51 am ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
90% of briggs will fail leakdown test after 50-60 hours. On average I see 15-20% leakage across the board don "so called healthy motors". The owner doesn't know otherwise. The problem is the valve seats not seating square, or moving after some heat cycles. If you want to build a good engine you run it for 50 or so hours, then you pull the heads and get some good valves, Recut the seats, lap them in, and re install heads would be the BEST thing you can do for any engine.
Author:  SETx Longtail [ Tue Mar 28, 2017 10:14 am ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
Author:  cb5331 [ Tue Mar 28, 2017 10:20 am ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
Another 50. :lol:
Author:  3rd Coast Killer [ Tue Mar 28, 2017 10:21 am ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
Author:  SETx Longtail [ Tue Mar 28, 2017 10:23 am ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
Thanks James, I figure if it's around 200 it would be worth it.

Clay- Fah-Q :lol:
Author:  TPerkins [ Tue Mar 28, 2017 4:31 pm ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
I'm at 200 on 37 heads. Mods done at 80hrs

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Author:  cb5331 [ Tue Mar 28, 2017 4:59 pm ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
Author:  cb5331 [ Tue Mar 28, 2017 4:59 pm ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
Author:  Russ [ Tue Mar 28, 2017 5:38 pm ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
Y'all think they're leaking?
Author:  cb5331 [ Tue Mar 28, 2017 6:06 pm ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
:lol: i kid, i kid
Author:  3rd Coast Killer [ Wed Mar 29, 2017 6:51 am ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
Author:  cb5331 [ Wed Mar 29, 2017 8:02 am ]
Post subject:  37 Briggs EFI Heads - 2 years since introduction - review?
Author:  libertarian [ Wed Mar 29, 2017 8:41 am ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
So, for those that are having heads worked on....are you having B&S do it under warranty? Any preferred shops in SE Texas or SW Louisiana? Does B&S have a leak down number that they will accept for warranty? Is there any recommended upgraded metallurgy that cures the problem?
Author:  cb5331 [ Wed Mar 29, 2017 8:55 am ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
Maxxis owns bayou surface drive, he's is sw la. Can do aftermarket valves and a better fix or warranty work. Great to deal with also. His info is on the sponsors page.
Author:  pokey79 [ Wed Mar 29, 2017 11:56 am ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
if I remember correct Boat Dr. said they have to leaking in the 50 to 60ish range for briggs to warranty them! Don't hold me to that.
Author:  cb5331 [ Wed Mar 29, 2017 12:09 pm ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
^ i knew it was crazy high. I saw someone post 90% one time but was pretty sure that was a little off. :lol:
Author:  libertarian [ Wed Mar 29, 2017 1:16 pm ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
I imagine B&S is doing some CYA with numbers so high their warranty repair rate is fairly low. I'm doing a deal on a new 35 GD SD Friday. Just wondering if I should run the crap out of it and get the hours up, then do a valve job. I don't see myself getting anywhere doing that unless B&S has a major upgrade or aftermarket has metallurgy upgrades. Then it voids the warranty, so SOL.
Author:  MaXXis85 [ Wed Mar 29, 2017 2:29 pm ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
Author:  pokey79 [ Wed Mar 29, 2017 2:37 pm ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
honestly 65 is the number that keeps popping up in my head.
Author:  MaXXis85 [ Wed Mar 29, 2017 2:51 pm ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
I regularly see 20%-40% leakage on these things.
Author:  cb5331 [ Wed Mar 29, 2017 3:26 pm ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
Author:  TPerkins [ Wed Mar 29, 2017 7:22 pm ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
I don't think I'd send the back to the manufacturer to rebuild. When they are the reason there broke.

Get a engine builder to work them. Don't have to get a crazy set. Quality will be far superior than what briggs will send ya.

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Author:  TPerkins [ Sun Apr 02, 2017 8:02 pm ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
I suppose I jinx'd myself..

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Author:  SETx Longtail [ Sun Apr 02, 2017 8:22 pm ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
Damn, you and James both eh?
Author:  Will C [ Sun Apr 02, 2017 8:38 pm ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
Dammit man.. its usally the roller rocker motors that do that. My condolences
Author:  TPerkins [ Mon Apr 03, 2017 5:51 am ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
Heads are already at delta. She'll by running real soon!

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Author:  3rd Coast Killer [ Mon Apr 03, 2017 7:01 am ]
Post subject:  Re: 37 Briggs EFI Heads - 2 years since introduction - revie
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