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Search found 424 matches

by dannobee
Sun Jun 13, 2021 10:04 pm
Forum: Engine Tech
Topic: stopping rust in a 4 year old race motor
Replies: 2
Views: 128

Re: stopping rust in a 4 year old race motor

You leave water in your race engine? Put some petcocks in the block drains and drain out all of the water occasionally. And don't let it sit over the winter with water in it. Any of the two part cooling system cleaners will work. The one with the phosphoric acid then neutralizer usually cleans up mo...
by dannobee
Fri Jun 11, 2021 1:10 pm
Forum: Engine Tech
Topic: Break in oil magic
Replies: 12
Views: 686

Re: Break in oil magic

The only place I could see a benefit would be flat tappet cam break-in. The race flat tappet cams would lose a lobe if you breathed on it wrong. Anything to help those out would be a plus. As for anything else, probably nowhere as critical.
by dannobee
Thu Jun 10, 2021 7:44 am
Forum: Engine Tech
Topic: Pick a head, any head.
Replies: 24
Views: 931

Re: Pick a head, any head.

Define "holding the motor back." That thing should be fast enough to scare you on the street, given that those trucks didn't hook at all.

Back to basics before changing anything major; check ignition timing and do a fuel volume test, and make sure the throttle opens all the way.
by dannobee
Tue Jun 08, 2021 9:34 pm
Forum: Engine Tech
Topic: distributor looens up
Replies: 20
Views: 846

Re: distributor looens up

But what is the root cause of the distributor moving? Putting a badass hold down might cure the symptom but not the cause. Is the distributor worn at the lower part, where it goes into the block (NOT the upper/intake manifold half)? Are the distributor bearings/bushings worn out? Is there an issue w...
by dannobee
Sat Jun 05, 2021 12:15 am
Forum: Engine Tech
Topic: 5.3 misfire after wot lifter collapsed
Replies: 2
Views: 227

Re: 5.3 misfire after wot lifter collapsed

VLOM filter screen plugged? Is the engine oil pressure low?

Do you have access to SI2000? Doc ID 4455388 (PIP4568S) goes over the correct diagnosis and repair.
by dannobee
Wed Jun 02, 2021 11:08 am
Forum: Engine Tech
Topic: Assumption: Valve train deflection increases with lift & higher spring load
Replies: 9
Views: 623

Re: Assumption: Valve train deflection increases with lift & higher spring load

One of the old tricks in Stock Eliminator was to loft the valve but pay close attention to the retainer to valve guide/seal clearance. That clearance then becomes "max valve lift."
by dannobee
Tue Jun 01, 2021 4:01 pm
Forum: Engine Tech
Topic: Sbc leakdown test reveals leak to ARP studs threads
Replies: 22
Views: 1174

Re: Sbc leakdown test reveals leak to ARP studs threads

Guys, he's not pressure testing the cooling system and he specifically said that there aren't any bubbles coming up through the radiator cap opening when he performed the leakdown on all of the cylinders, but pressure did come up through the head bolts (studs). That leaves only one possibility, and ...
by dannobee
Sun May 30, 2021 8:49 pm
Forum: Engine Tech
Topic: Sbc leakdown test reveals leak to ARP studs threads
Replies: 22
Views: 1174

Re: Sbc leakdown test reveals leak to ARP studs threads

Time to pull it apart and check flatness and surface finish for what is recommended for those particular head gaskets.
by dannobee
Sat May 29, 2021 8:21 am
Forum: Engine Tech
Topic: Open or Crate?
Replies: 25
Views: 1368

Re: Open or Crate?

Before you go sinking lots of money into the engine, how much is the claim? And what are the rules for claim? Can the inbred hilljacks ten laps down claim the engines of the top 5 finishers? How often do other competitors claim? How big is the track? If it's a half mile track, you might want a few m...
by dannobee
Sat May 29, 2021 8:09 am
Forum: Engine Tech
Topic: BMW N62 valve guide replacement
Replies: 20
Views: 622

Re: BMW N62 valve guide replacement

Yup, use a flex hone (aka ball hone). Sneak up on the size, and very carefully, as it's easy to remove too much material. Chuck the hone up in your drill and hone for a couple of seconds, then clean and recheck the size. Total hone time will likely be under 10 seconds for each guide. Possibly well u...
by dannobee
Wed May 26, 2021 6:39 pm
Forum: Engine Tech
Topic: 83' C30 6.2L diesel
Replies: 11
Views: 338

Re: 83' C30 6.2L diesel

There's no guarantee that the short block is good. We'd see them in for oil consumption only to find the upper parts of the cylinders worn out.
But even turbocharged they were still gutless. Without a turbo they were slower than a pregnant nun going to confession.
Brings back memories. All bad.
by dannobee
Sat May 22, 2021 4:10 pm
Forum: Engine Tech
Topic: What is the typical roughness R values for Alloy/Nikasil bores ?
Replies: 14
Views: 515

Re: What is the typical roughness R values for Alloy/Nikasil bores ?

ES Motors is based in Istanbul, maybe ask Emre who he uses for Nikasil honing/finishing.

http://www.esmotor.com.tr/
by dannobee
Sat May 22, 2021 3:58 pm
Forum: Engine Tech
Topic: Compression ratio with IRON heads on pump gas?
Replies: 17
Views: 1039

Re: Compression ratio with IRON heads on pump gas?

1990's LT1's had aluminum heads (except for the I'mpala SS/Cop Car heads). The heat dissipation is worth about 1 point of compression. If you believe the engineers at GM do everything for a reason, the iron head LT1's had bigger chambers than the aluminum heads in the F and Y bodies. Obviously GM lo...
by dannobee
Thu May 20, 2021 10:48 am
Forum: Engine Tech
Topic: Man, it smells - Just the nature of the beast?
Replies: 11
Views: 994

Re: Man, it smells - Just the nature of the beast?

One thing that factory carbs had was a choke pull-off (aka Choke Break) that would crack open the choke once the engine started and vacuum was applied to the diaphragm. This had the effect of leaning out the carb once the engine started and a closed choke was no longer required. See if one can be re...
by dannobee
Wed May 19, 2021 7:57 pm
Forum: Engine Tech
Topic: Holley Street Avenger - choke stuck
Replies: 8
Views: 271

Re: Holley Street Avenger - choke stuck

It should spring back to the closed position, even if very slightly. If it had a choke pull-off, it'd have quite a bit more tension and the pull-off would overcome that as soon as it lit off and developed vacuum. I'd first verify that the linkage isn't binding as 1980RS experienced. Remove the choke...