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| slant6s with hydraulic valves need for education https://www.slantsix.org/forum/viewtopic.php?t=32634 |
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| Author: | bob fisher [ Fri Dec 05, 2008 7:14 am ] |
| Post subject: | slant6s with hydraulic valves need for education |
hello sl6 sages- trying to improve my knowledge about the late editions of the sl6 with hyd valves. my main question is whether this engine(apparently made 81-87 in cars and 87-91 in p/u trucks) was an improvement over the the original sl6 with solid lifters made from 59-80. my other question is why was this change made-im guessing themain reason for the change was to eliminate the need to periodically adjust valve lash which really wasnt a big job anyway and was only infrequently needed. want to know this since i figure it likely that at some point i will acquire one maybe in a pickup as the older a and f bodies disappear into rust flakes. would appreciate it if sages could clarify the upsides and downsides of these last sl6s. i.e. did they run better, more durable, better mpg, longer lived valve train etc.? two old concerns i wouldhave are that some hyd. valves are generally not adjustable and some hyd. valve lifters collapse . looking forward to hyd. valves 101. thanks for your interest. paladin(still have my 2 rare birds- 80 volare wagon w/3 spd and 76 feather duster) |
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| Author: | 6shotvanner [ Fri Dec 05, 2008 7:37 am ] |
| Post subject: | |
To my knowlage 87 was last /6 in pickup/van as well as cars.My main slant is a hydro(83) and before rebuilding it had 185k on the odo with no prob ever on the lifters.As to any pro's and con's I'll leave that to true /6 guru's. |
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| Author: | Doc [ Fri Dec 05, 2008 9:44 am ] |
| Post subject: | |
My research showed that the main reason the change way made was to get the engine to pass the increasingly tight emissions requirements. DD |
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| Author: | SlantSixDan [ Fri Dec 05, 2008 11:10 am ] |
| Post subject: | |
Doc is correct. The change to hydraulic lifters was done because the emissions characteristics of the solid-lifter engine varied with lash adjustment, both initially and over time. The reduced maintenance was a nice benefit to buyers. The cam used in the hydro-lifter slant-6s is a pretty weak smogger grind, often installed very retarded (and very randomly; QC at Chrysler was basically nonexistent in those years), but better cams are available. The most interesting thing about these engines is the "backwards" oil feed path to the lifters. Rather than substantially change the block for conventional side-feed lifters, they increased oil volume to the rocker shaft and piped oil through the rocker arms, down through hollow pushrods, and into the lifters from the top. And yeah, the last year for the slant-6 in trucks and vans outside Mexico was '87. |
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| Author: | Reed [ Fri Dec 05, 2008 11:21 am ] |
| Post subject: | |
Quote: And yeah, the last year for the slant-6 in trucks and vans outside Mexico was '87.
Dang it, why did Crysler give the best stuff to other countries? Slants lasted longer, the cars looked cooler. Grrr.
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| Author: | DusterIdiot [ Fri Dec 05, 2008 6:26 pm ] |
| Post subject: | Zoinks.... |
Quote: Dang it, why did Crysler give the best stuff to other countries?
Probably because they moved their tooling there for cheaper 'production' ... A fair amount of the trucks up through the 90's were made at the Alberto Lago plant in Mexico(including my 1992 Ramcharger....)-D.Idiot "You know Mexico the heartland of North America...according to Futurama..." |
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| Author: | Reed [ Fri Dec 05, 2008 10:28 pm ] |
| Post subject: | |
In a related question, how would one go about using a stock cam to the best advantage? For instance, assuming a stock hydraulic cam, where should the cam be centerlined to assure good low-end torque and performance in the 0-3500 RPM range? |
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| Author: | DadTruck [ Sat Dec 06, 2008 6:36 am ] |
| Post subject: | cylinder heads and lifters |
and in a related question, can a cylinder head from the solid lifter era be used with a block, and valve train components from the hydraulic lifter generation? specifically is the increased oil flow mentioned above a function of block oil porting only, or is the cylinder head itself a part of the hydraulic lifter package? thanks |
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| Author: | SlantSixDan [ Sat Dec 06, 2008 7:19 am ] |
| Post subject: | |
Quote: Dang it, why did Crysler give the best stuff to other countries?
What best stuff? By the time of its discontinuation in upper North America, the poor old slant-6 had been badly neglected, cheapened, and slowly strangled. Several significant engineering upgrades had been studied and prototyped but cancelled before production. 
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| Author: | slantzilla [ Sat Dec 06, 2008 7:39 am ] |
| Post subject: | Re: cylinder heads and lifters |
Quote: and in a related question,
I have a hydraulic head on a solid lifter motor. As far as I have been able to tell, the main difference is in the rear oil hole. The hydro head uses a 3/8" bolt that necks down to 5/16", but so did the later solid heads.can a cylinder head from the solid lifter era be used with a block, and valve train components from the hydraulic lifter generation? specifically is the increased oil flow mentioned above a function of block oil porting only, or is the cylinder head itself a part of the hydraulic lifter package? thanks As far as bolting one on I use the same head gasket as a solid head. The valve cover and gasket are specific to the type head though. |
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| Author: | Charrlie_S [ Sat Dec 06, 2008 7:50 am ] |
| Post subject: | |
The increased oil flow is a function of a groove (instead of two oil holes) on the rear cam journal (not the cam bearing). This allows constant oil feed, instead of a "pulse" of oil every cam revolution. |
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| Author: | SlantSixDan [ Sat Dec 06, 2008 7:59 am ] |
| Post subject: | Re: cylinder heads and lifters |
Quote: is the increased oil flow mentioned above a function of block oil porting
Some threads to see: here, here.
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| Author: | DadTruck [ Sat Dec 06, 2008 9:45 am ] |
| Post subject: | |
thanks this forum is superb how slant six dan knows where all this info is stored is beyond me. I used the search function for an hour, never came close to either of those two informative posts |
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