Chevy engines

[Jff24Gordn]

http://www.angelfire.com/tx5/gmpistonslap/index.html

This is also why GM has released a recent TSB saying that opening 4 quarts of oil to add to your crankcase between a 7,500 mile recommended oil change interval (1 qt per 2K miles on an engine with 36K miles or less is "NORMAL". After 36K miles, all bets are off (there is no abnormal oil usage rate)

:--)

 

[DGFoster]

Sounds about right for a GM engine

 

[JConley]

Go over to the dieselpage, and you will find other happy GM owners.

 

[rkressg]

GM Service Quality

I had a 93' White on White Typhoon. The truck came with a 3/36. At 25 or 30k the motor detinated and died. It was still under warranty at the time and bone stock. The service manager refused to warranty the engine, claming I had modified the engine. He said "The motor blew because of added stress of a turbo charger. I can not warranty this because GM has never produced a vehical with a turbo charger". I was so upset, I was beyond words. I reminded him of the Buick Grand National (3. 8 Turbo) and the GMC Syclone (4. 3 turbo) which I still own :-laf . He said he was not familar with any of these vehicals or that these vehicals were even produced.



I do not want to name #1 Cochran, but this un named GM dealer is one of the biggest GM dealerships in the US. I rebuilt the motor my self, but eventually sold it. I still own the Syclone, but it has a wilder engine than I could build. The stock engine sheered the crank in half. The second engine sheered a forged billet crank in half. This motor is bullet proof. I had to go a long way to find a good machine shop, but www.tobefast.com is the best shop in the east US.



No matter how bad D/C service is at times, it is no where close to what GM's was like #@$%! GM just puts out crappy products, blames the customer, then sticks them with the bill to fix their (GM's) problems.

 

[HoleshotHolset]

Sy/Ty 4. 3L engines were NEVER designed to be turboed.

The only thing that even remotely makes them able to withstand some boost is the hyperutectic (I'm bad at spelling... . ) pistons.

They had stock (crappy) rods... . a horrible truck cam..... stock crank, absolutely crappy detonation prone heads, etc.



The GN/T-Type was a much better setup... . good old 3. 8L. Steel crank, better rods, better pistons, and are much less prone to detonation due to better cylinder head design.



I have a experience with both setups... . they are both VERY evil street racing vehicles. I've driven a 10-second Sy... . it's nothing shot of insanity!



Sy/Ty's are a hodge-podge of parts... . whatever GMC could scrounge up in the parts bin and toss into the engine compartment with NO thought to the person who services it..... that's about all they did. At least PAS did a good job on the interior/exterior stuff.



Matt

 

[rkressg]

Don't get me started on the 4. 3 z-block, not the w-block. The GMC Syclone and Typhoon (z-block) were factory turbo charged liquid intercooled engines. They were not built by GMC. GMC just built the a rolling chassis. The Syclone engines were built by PAS (Production Automotive Services) The internals of a z-block are entirly different from a blazers w-block. The entire design of a z-block is around turbo charging. Granted the original construction of these motors was not great, they were designed to be turbo charged. The rods were weak, the cam sucked, and the heads blew, but the potential of a 4. 3 z-block is far beyond the 3. 8 in the GN. I did have many problems with the stock engine, but after a few tries, it will stand up to anything you can throw at it.



P. S. I got rid of the crappy TH700-RS 4 speed. When I put the newest engine in the truck, the transmission absolutely melted. It is now in the process of me putting in a new prop shaft (Broke that).

 

[HoleshotHolset]

GMC did build the blocks... . the only thing PAS supplied was the induction (turbo {Mitsubishi TD05-17C}, intake, fuel system {batch fire... . very similar to the old L-98's..... GN's are sequential fire... . }), exhaust (manifolds, DP, rest of the exh. system... )



BTW, the Z-VIN designation refers not only to the Sy/Ty engines, but also to the regular old production 4. 3L TBI engines... . the only parts inside of this engine that are different from the TBI engines are the pistons... they are dished for lower compression.



The W-VIN designation refers to a completely different 4. 3L block that has a balance shaft... improved swirl port heads, better cam, stronger rods, etc.



So... . basically GMC sent out rolling chassis with the engines in them... . THEN PAS bolted on their parts onto the engine and it ran... . barely. There is still debate on whether the engines were shipped to PAS without all the stuff on them in crates, or if they were shipped bare to PAS in the chassis... .



Matt

 

[Spaceace]

been there-----done that

Played the same game with F**d on my 5. 4L F250. 3 trips to the dealer... We can't replicate... yet there was a TSB covering my VIN.



Well known in the F**D camp.



Come to think of it Jeep and the 4. 0L had a "slight" misbore problem that cost them thousands of new short block or extended warranties.

 

[TPCDrafting]

I have to admit, my last truck was a '91 chevy 1500 4x4 with a 350 5spd. I drove the CRAP out of it. Bo and Luke Duke would have been scared to sit shotgun. Goin hunting one year the fitting where the oil went into the cooler worked loose and I climbed Eisenhower on I-70 (out of tree line for those that havn't been there) with 2 quarts of oil. I was still passing everything on the road. I put 180,000 on it and the ONLY reason I traded off for the Dodge was I wanted something that had more power and stability to pull a trailer. And I wanted a diesel (not something that sounded like a bucket of bolts and nuts shaking under the hood!

To make a long story longer, if I were to buy a gas powered pickup again, I would buy another Chevy. Except of course I like the looks of that new sport Dodge with the v10!!!

so quit yer :-{}

 

[HoleshotHolset]

no :-{} here... . I'm just stating facts.



A buddy of mine had to have all of the main bearings in his '97 TJ 4. 0L replaced at 40k miles... . low oil pressure was the symptom... . all is well at 90k miles now... .



Remember the old 300cid I6 F*rds? Well, around 1990 or so F*rd decided to try and cut too many cranks without changing the knifes on their lathes..... many cranks weren't right from the get-go and soon they would develop low oil pressure..... take the crank out... . grind it till it's true... put in new bearings and it's good to go.



Yeah, the 6. 2/6. 5L TD's do sound like a rigorously shaken bucket of bolts... . and they had their share of headgasket/piston/etc problems... . but some folks had really good luck with them... ...



I've replaced those @#*% o-rings on the oil-cooler lines' engine block 'sandwich adapter' on the '88-'98 GM's... . man, do they ever leak oil when they go bad..... all of 'em that came in had very little oil in them..... after the fix... so far, so good!



Matt

 

[mimprevento]

Chevy

I said it once or twice and will say it again- I have driven the snot out of these motors for years- LT-1, LS-1, 350 TBI in my 95 Tahoe- all excellent - all strong- my truck has 143,000 hard miles on it- the 350 set-up is among the all time great engines- I am sure there have been manufacturing problems that have to be addressed but with Mobil 1 and proper care these have been my favorite engines- my LS-1 powered Trans Am only slapped Fords not pistons- 'nuff said

 

[BK]

mimprevento , I know that a lot of the good 'old GM motors were great, but the recent snafu addresses their newest attempt at the newest series. .

The great Vortec...

How come GM keeps selecting bad names for their new products. .

Who wants to be in an avalanch??? not me, I run like heck from one...

The aztecs. . look at what happened to them.

Being in a vortec is not a good thing..... usually what I felt like fter a very long night of drinking with the boys when I was younger. .



sorry about the spelling. .

 

[TPCDrafting]

Dad has a '95 chev with the 6. 5 diesel. It runs good till you put it under any load, then it breaks something. Good thing for him, the most he ever carries is a golf bag. He can beat me off the line with the auto, but I'll drag him anywhere he wants to go. You can't here the turbo in that thing even with the radio turned off. I recently pulled the silencer ring from mine, wait till he hears that!! He was having troubles for a while with an ECM that's mounted right on top of the head. It would overheat and malfunction. Nice place to mount something that's heat sensitive chevy! Right in the V. I turned him onto the chevy-diesel web site and he got it replaced without guess work. I told him if it were anything like the TDR, he'd find it there.

 

[DHatfield]

MY brother has a 6. 5 Diesel in his Blazer and he has never had problems with it. I keeps tellin me that his 6. 5 is better than my Cummins, but I think he is lost in the dark ages or somethink is I know that is not true.

 

[Chipstien]

BK, I haven't laughed that hard in a long time.

 

[BK]

Chipstien ,

thanks,...



but how can we forget Chevy's best. .

the

NOVA. .

In spanish roughly translated it ment. .



"no go"



And their sales were terrible in mexico.



but that's an oldy but goody. . thought they would have learn their lesson from back then.