Search found 265 matches
- Sun Nov 26, 2023 3:12 pm
- Forum: Engine Tech
- Topic: GM 12555331 vs 12363757 Intake Valve 2.0" x 0.343"
- Replies: 1
- Views: 247
GM 12555331 vs 12363757 Intake Valve 2.0" x 0.343"
GM Valves.jpg GM Valve Photo.jpg I've had some good luck with the GM 12555331 IN and 12551313 EX valves. They are light weight and have good flow numbers. I have not tried (or seen) the GM 12363757 IN or 12363758 EX valves. Does anyone have any experience with them and know the typical weights of t...
- Thu Dec 01, 2022 12:55 am
- Forum: Engine Tech
- Topic: Piston skirt protrusion at BDC
- Replies: 7
- Views: 797
Re: Piston skirt protrusion at BDC
Check the amount of piston "rock" at BDC on the lowest point on the piston skirt. If it is in the range of 0.050" or more, you may have ring seal issues and oil usage..
- Tue Jun 15, 2021 11:46 pm
- Forum: Engine Tech
- Topic: Deep scratch- GM 454/438hp roller cam
- Replies: 21
- Views: 2444
Re: Deep scratch- GM 454/438hp roller cam
I’m currently don’t have the cam to see but i think it was the closing side. The scratch is fairly deep. Very noticeable with the thumb nail. Don’t know the lifter travel but used these lifters on another more aggressive cam for a few years and no issues. Is there a way to check to see if there’s l...
- Mon Jun 14, 2021 7:26 pm
- Forum: Engine Tech
- Topic: Deep scratch- GM 454/438hp roller cam
- Replies: 21
- Views: 2444
Re: Deep scratch- GM 454/438hp roller cam
Is the mark on the opening side or closing side of the lobe?
Approximately how deep is the scratch/mark?
Do you know how much lifter travel the Howard's lifters have?
I ran across a similar problem on some air boat engines (540 cid BBC, 6000 max. RPM).
Approximately how deep is the scratch/mark?
Do you know how much lifter travel the Howard's lifters have?
I ran across a similar problem on some air boat engines (540 cid BBC, 6000 max. RPM).
- Sun Jun 13, 2021 8:41 pm
- Forum: Engine Tech
- Topic: Anyone know what a short deck Aurora block weighs ?
- Replies: 1
- Views: 525
Re: Anyone know what a short deck Aurora block weighs ?
According to this, the as recieved weight is 167 lbs. 24502650— Bow Tie CNC Racing Block “Short Deck”This “CNC machined” cast iron bow tie block has an 8.200" deck tocrankshaft, compared to the standard block with a 9.025" deck. This block isdesigned for small cubic inch engines used in dr...
- Mon May 24, 2021 4:15 pm
- Forum: General Tech
- Topic: DLL file
- Replies: 2
- Views: 1590
- Mon May 24, 2021 3:40 pm
- Forum: Engine Tech
- Topic: MSD 6AL questions.
- Replies: 12
- Views: 1377
- Tue Oct 13, 2020 1:56 am
- Forum: Engine Tech
- Topic: chevy engine ID number
- Replies: 3
- Views: 644
Re: chevy engine ID number
I suspect the "7" is actually a "T" If so, the decoding of the engine is: K = St. Catherines, Ontario Engine Plant Build Date: 04 = April 24 = 24 day TXD = 1975 350 cid conv.cab pickup VIN L LS9 165 HP 4 BBL. C-20 to 3500 According to the factory published 1975 literature the LS9...
- Sun Jun 14, 2020 10:43 pm
- Forum: Engine Tech
- Topic: NHRA STOCK valve job
- Replies: 52
- Views: 6301
Re: NHRA STOCK valve job
Any "cut" that is concentric with the valve guide is legal.
No grinding marks, must be cutter marks. The "cut" can extend into the combustion chamber or below the valve angles.
Any number of angles and any angles are allowed.
No grinding marks, must be cutter marks. The "cut" can extend into the combustion chamber or below the valve angles.
Any number of angles and any angles are allowed.
- Mon Dec 30, 2019 1:25 pm
- Forum: Engine Tech
- Topic: Mill cylinder head/seat work without pilot
- Replies: 74
- Views: 8717
Re: Mill cylinder head/seat work without pilot
While I appreciate machining valve seats as accurately as possible, if you consider that the valve temperatures and seat temperature are in the 600F to 1500F range, and with spring loads in the 90 lb. to 800 lb. range, it would seem that the thermal distortions are way beyond the need to have seats ...
- Mon Dec 30, 2019 1:48 am
- Forum: Engine Tech
- Topic: ARE ALL sbc 010 BLOCKS HIGH NICKEL????
- Replies: 105
- Views: 41368
Re: ARE ALL sbc 010 BLOCKS HIGH NICKEL????
I worked at an OEM and we had a SEM that would identify the chemistry of the metals. Cut and pasted from this source: https://www.labtesting.com/services/materials-testing/metallurgical-testing/sem-analysis/ SEM Analysis with EDS Capabilities Scanning Electron Microscopy (SEM) is a test process that...
- Mon Aug 19, 2019 1:58 pm
- Forum: Engine Tech
- Topic: Why haven't we moved to higher DC voltages?
- Replies: 36
- Views: 3811
Re: Why haven't we moved to higher DC voltages?
I worked for an OEM in R&D for a few years. We worked on the 36V & 42V systems for a while in 1999~2003. One of the big problems we faced was arcing in switches, causing them to NOT meet the durability specifications. Other suppliers (AC, window regulator, radio,...…) reported problems as we...
- Sun Dec 02, 2018 2:23 am
- Forum: Engine Tech
- Topic: Oil level
- Replies: 17
- Views: 3574
Re: Oil level
I got it from McMaster Carr I believe. It's mainly a oil level- temp sight glass for a hydraulic tank for various types of machines. So you would rather crawl under your car instead of using a dipstick? Tom Not a big deal to get on my hands and knees and peek thru the rear of the front tire. Also I...
- Thu Oct 25, 2018 12:13 am
- Forum: General Tech
- Topic: Any mathematics gurus that can figure a real world problem?.
- Replies: 20
- Views: 15963
Re: Any mathematics gurus that can figure a real world problem?.
If you look at the equation for "period"/time, you will note the "L" (rope length) in the numerator of the square root function. As "L" increases, "T" (time) increases. Aerodynamics will play a small role, but almost insignificant when compared to the gravitat...
- Thu Aug 02, 2018 12:22 am
- Forum: Shop Equipment - For Sale or Wanted
- Topic: Looking To Donate A Dyno To A School
- Replies: 1
- Views: 2133
Re: Looking To Donate A Dyno To A School
What additional items would the school have to purchase to make the dyno fully functional and could you give a rough estimate of the cost of the additional items?