| [GMCnet] Engine oil restriction device in a 455 [message #283579] |
Thu, 30 July 2015 21:35  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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The extra 455 that came with Glenn's GMC had camshaft oil restrictors installed in the oil passages that lubed the camshaft. Those passages were all drilled, and taped. Then 3/8th Allen set screw with a .100 inch hole drilled in it was installed. The oil hole in the cam bearing has a .160 inch hole. Found them during the block cleaning process before boring the cylinders. I question the benefit of that oil restriction. The block is now bored, and cleaned again. Crank is now turned with the oil outlets in the journal radius ed. The crank rough surface of the counter weights have been smoothed off along with the crank parting lines. Then balanced the crankshaft, rods, pistons, flywheel, and harmonic dampener. Tomorrow I need to re clean the block, crankshaft, and all internal parts again.
Bob Dunahugh
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| Re: [GMCnet] Engine oil restriction device in a 455 [message #283583 is a reply to message #283579] |
Thu, 30 July 2015 22:44  |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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The reason if I remember correctly is not to force more oil to the bottom end but to keep it from "hanging out" up top. However this isn't a jet boat app so I question it in our RPM range.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Engine oil restriction device in a 455 [message #283602 is a reply to message #283579] |
Fri, 31 July 2015 10:28 |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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As a note. I've talked to Dick Paterson on oil restriction devices as listed below. We both agree that engines in our application. Neither idea is appropriate for our engines.
John. Yes, There is a way of keeping less oil from going into the valve covers by way of the lifters. But the restriction listed below is to reduce the oil to the cam bearings only. What I find interesting. Is that some engine builders recommend installing oil restriction devices in these 403, and 455 Olds engines. Then recommend the installation of high volume oil pumps in our GMC coaches. Because the one GM installed isn't big enough. Then install oil restriction devices. If GM was wrong in the design of our engines. How have these engines held up so well when properly maintained? I fully under stand that modifications to these engines is required in engines that are used in ways that GM hand no intent of them being used in. GM did make some changes to their car engines for our application. But oil restriction devices, and high volume oil pumps weren't on that list. The thing is that there was signs of cambearing damage due to the lack oil enough oil being delivered to the bottom of the camshaft bearings. I need to bring some of this stuff to the Rally in Rapids City for all to see. Bob Dunahugh
The extra 455 that came with Glenn's GMC had camshaft oil restrictors installed in the oil passages that lubed the camshaft. Those passages were all drilled, and taped. Then 3/8th Allen set screw with a .100 inch hole drilled in it was installed. The oil hole in the cam bearing has a .160 inch hole. Found them during the block cleaning process before boring the cylinders. I question the benefit of that oil restriction. The block is now bored, and cleaned again. Crank is now turned with the oil outlets in the journal radius ed. The crank rough surface of the counter weights have been smoothed off along with the crank parting lines. Then balanced the crankshaft, rods, pistons, flywheel, and harmonic dampener. Tomorrow I need to re clean the block, crankshaft, and all internal parts again.
Bob Dunahugh
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| Re: [GMCnet] Engine Oil [message #301366 is a reply to message #283579] |
Wed, 01 June 2016 12:01 |
james Ernst
Messages: 79
Registered: December 2013
Location: Lincoln, NE
Karma: -4
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On Jun 1, 2016 11:55 AM, "james Ernst" wrote:
>
> Hello gang,
> I know this has been discussed ad nauseum but while at Walmart last night
looking at engine oil I have a couple questions.
> I picked up a gallon of Rotella T straight 30 for the Onan.
>
> Then for the the coach I ran across Mobil 1 10-30 High mileage 5qt jug
$22. It has the extra wear and heat protection additives.
>
> Also, Valvoline new 15-40 HD diesel now with 25% less wear based on cam
lobe wear. Apparently updated anti wear pkg. It is a semi synthetic.
14.95/gal.
>
> I had been using Rotella T 15-40.
>
> I know some of you use the Rotella semi synthetic and full synthetic too.
>
> I was just thinking it's time to move to synthetic blend or full.
>
> Any thoughts on both the oils for the Onan and 455 would be appreciated.
>
> Thanks,
> Jim Ernst
> Columbus, NE
> 77 PB
> 77Kingsley
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