Search found 809 matches
- Wed Mar 06, 2024 7:45 pm
- Forum: Engine Tech
- Topic: Non-resistor plugs with coil-on-plug ignition
- Replies: 2
- Views: 326
Non-resistor plugs with coil-on-plug ignition
There's been a lot of talk about using resistor vs non-resistor plugs with common distributor HEI ignitions, and also with restive plug lead vs copper wire plug leads. A lot of it boils down to how much electrical interference you and your car can tolerate. What about using non-resistor plugs with a...
- Wed Mar 06, 2024 6:44 am
- Forum: Engine Tech
- Topic: HEI pulling timing. Any solutions?
- Replies: 45
- Views: 2260
Re: HEI pulling timing. Any solutions?
The retardation of the timing with a magnetic pick up ign is an electrical issue, not a mechanical one. It is caused by distortion of the AC sine wave generated by the pick up & the distortion increases with RPM. Geoff, see also my post here -> https://www.speed-talk.com/forum/viewtopic.php?p=9...
- Mon Feb 26, 2024 10:26 pm
- Forum: Engine Tech
- Topic: HEI pulling timing. Any solutions?
- Replies: 45
- Views: 2260
Re: HEI pulling timing. Any solutions?
Some years ago now while messing with home made ignition boxes I found that magnetic trigger distributors were sensitive to how much resistance is placed across the pickup coil by the module. Lower resistance interacts with the inductance of the pickup coil and causes a phase shift that effectively ...
- Sat Oct 28, 2023 6:40 am
- Forum: Vintage/Classic/Historical Engine Tech
- Topic: Electronic ignition on the flywheel
- Replies: 23
- Views: 3764
- Mon Sep 04, 2023 11:10 pm
- Forum: Engine Tech
- Topic: Loud Exhaust
- Replies: 42
- Views: 4227
Re: Loud Exhaust
The muffler hangers are a factor too. Yep. A piece of hanger strap that is bent into a 90 deg curve has flexibility in all three planes. If the strap is straight there is very little give lengthwise and that can transmit conducted noise to the bodywork, especially if connected to a flexy part of th...
- Thu Aug 17, 2023 7:32 am
- Forum: Engine Tech
- Topic: Super Victor sharpie experiment
- Replies: 47
- Views: 4579
Re: Super Victor sharpie experiment
HQ, Have you noticed the trend in recent years is to thin out the leading edge of the divider to almost a sharp edge, rather than have a bull nose shape. Supersonic planes have sharp leading edges. Normal subsonic planes have rounded leading edges. So with a manifold divider it would depend on the ...
- Wed Aug 16, 2023 11:33 pm
- Forum: Engine Tech
- Topic: Gain from lifter bore blueprinting?
- Replies: 42
- Views: 5305
Re: Gain from lifter bore blueprinting?
I have never saw a factory block that was right. Probably best case scenario is find a block that has ran and shifted or settled ,then fix it. Most are horrible,angles off,location etc Would an inline engine be more likely to have accurate lifter bore positions ex factory given the ones I have seen...
- Mon Jun 26, 2023 7:51 pm
- Forum: Engine Tech
- Topic: Adding weight to water pump pulley or alternator pulley as a crankshaft damper?
- Replies: 16
- Views: 1182
Re: Adding weight to water pump pulley or alternator pulley as a crankshaft damper?
Yes. If the elastomer did not dissipate the energy the peak to peak movement of the outer ring would increase to infinity! The losses in the elastomer dictate the Q factor or sharpness of the resonance. Whether it really digs in over a narrow rpm range or has a lesser effect over a broad rpm range. ...
- Sat Jun 24, 2023 8:44 am
- Forum: Engine Tech
- Topic: Adding weight to water pump pulley or alternator pulley as a crankshaft damper?
- Replies: 16
- Views: 1182
Re: Adding weight to water pump pulley or alternator pulley as a crankshaft damper?
Also, why does the inertia of the crank damper have to be coupled trough rubber or a viscous oil? Wouldn't just the inertia of a heavy pulley absorb the harmonics like a second flywheel? Adding rotational inertia to the front of the crank in the form of a second flywheel will lower the fundamental ...
- Mon May 15, 2023 8:57 am
- Forum: Engine Tech
- Topic: "Running on gas vapors got me 400MPG" really?....
- Replies: 57
- Views: 5338
Re: "Running on gas vapors got me 400MPG" really?....
A piston on the downstroke working against say 18” of vacuum at cruise absorbs quite a bit of energy. Try pulling the plunger out of a blocked syringe of any decent diameter. Then calculate the force of 2/3 atmospheric pressure on the underside of a 4 inch diameter piston. About 120 pounds. Pull th...
- Sun May 14, 2023 7:06 pm
- Forum: Engine Tech
- Topic: "Running on gas vapors got me 400MPG" really?....
- Replies: 57
- Views: 5338
Re: "Running on gas vapors got me 400MPG" really?....
There must be something to the heat thing, all of my sbc powered cars gain 1-2 mpg when the weather warns up. Power goes down accordingly. At first I thought it to be related to the choke, but a manual choke, or in some cases no choke proved it to not be much of a factor. My afr gauges say the rati...
- Wed May 10, 2023 8:32 am
- Forum: Vintage/Classic/Historical Engine Tech
- Topic: Oiling issue with cross drilled crank? Old mini
- Replies: 8
- Views: 3568
Re: Oiling issue with cross drilled crank? Old mini
Whenever I hear of grooved lower half bearings it always makes me think of the difference in behavior between a grooved and a bald tyre on a wet road. There may be some degree of correlation.
- Fri May 05, 2023 5:28 am
- Forum: Engine Tech
- Topic: LS Coils w/ Built In Ignitor
- Replies: 3
- Views: 653
Re: LS Coils w/ Built In Ignitor
They all do AFAIK.
- Wed Apr 19, 2023 8:44 am
- Forum: Engine Tech
- Topic: Which way makes the most power ?
- Replies: 12
- Views: 1200
Re: Which way makes the most power ?
Would be fun and games balancing one of those things. Pretty cool though.
- Mon Mar 13, 2023 9:49 pm
- Forum: Engine Tech
- Topic: Replacing aluminium head with cast iron?
- Replies: 9
- Views: 672
Replacing aluminium head with cast iron?
I am so over aluminum heads that warp and allow the head gasket to quit at the first sign of overheating, and the consequent expense and inconvenience of repairs. ](*,) Both of our late 90's Camrys have needed this in the last 2 years. If one had the resources to produce a cast iron replacement head...