Speed-Talk is running on www.Speed-Talk.com

IMPORTANT: Update your bookmarks to https://www.speed-talk.com/forum/
(Right-click the URL and select "Bookmark this link")

Search found 658 matches

by BCjohnny
Sat Oct 24, 2020 2:44 pm
Forum: Engine Tech
Topic: open deck cylinder towers
Replies: 14
Views: 529

Re: open deck cylinder towers

Detonation .......
by BCjohnny
Wed Oct 21, 2020 11:03 am
Forum: Engine Tech
Topic: Syncro seat stones.
Replies: 5
Views: 482

Re: Syncro seat stones.

Steve, and apologies if this is also obvious ...... When dressing stones, depth of cut and speed the diamond is swept can affect the relative coarseness, and the finish any given stone will produce Keep the diamond sharp , rounded diamonds rub & ‘pluck’ rather than cut Bolt the dressing stand down, ...
by BCjohnny
Tue Oct 20, 2020 12:41 pm
Forum: Engine Tech
Topic: Electrical system troubleshooting
Replies: 15
Views: 524

Re: Electrical system troubleshooting

The simplest way to proceed with this is to take a known good battery of similar capacity and substitute it for a few days

Swap yours onto the donor vehicle as a double blind test, if possible

Then you'll have a direction
by BCjohnny
Tue Oct 20, 2020 6:17 am
Forum: Engine Tech
Topic: Syncro seat stones.
Replies: 5
Views: 482

Re: Syncro seat stones.

Not quite sure what 'Synchro' stones are, but if they're symmetrical threaded bush stones such as Sioux, reversing and dressing both sides, usually with a different angle, is common Some manufacturers' stones come formed that way It can allow more stone dressing before you get into the threaded inse...
by BCjohnny
Tue Oct 20, 2020 5:48 am
Forum: Vintage/Classic/Historical Engine Tech
Topic: South America Jeep Tornado SOHC engine
Replies: 18
Views: 726

Re: South America Jeep Tornado SOHC engine

Thanks for the clarification, Ken .......


Ken_Parkman wrote:There is a sheet metal alignment retainer the goes on over the cam deck studs and tabs go into the upper ends of the rockers. Not exact, only gets you in the ballpark.
Oh dear, it just gets worse ...... lol :?
by BCjohnny
Mon Oct 19, 2020 5:16 am
Forum: Vintage/Classic/Historical Engine Tech
Topic: South America Jeep Tornado SOHC engine
Replies: 18
Views: 726

Re: South America Jeep Tornado SOHC engine

...... but the bigger issue seems to be the overlapping rockers cut little grooves in the lobes ...... Yes, that's the 'problem' that jumps out from just looking at the design Two ball stud mounted rocker followers running on the same lobe, with the clearance necessary in a non-hydraulic set up ......
by BCjohnny
Sat Oct 17, 2020 5:53 am
Forum: Vintage/Classic/Historical Engine Tech
Topic: South America Jeep Tornado SOHC engine
Replies: 18
Views: 726

Re: South America Jeep Tornado SOHC engine

PS: We love history! Sure do Not trying to steal anyone's thunder, but always intrigued by old designs, so dug up some online stuff about the earlier 6 lobe version ...... Kaiser_Tornado_engine.jpg Kaisersohc.jpg Kaisersohccam.jpg As said, LSA taken care of by obtuse stud separation angle and wide ...
by BCjohnny
Mon Oct 05, 2020 8:04 am
Forum: Engine Tech
Topic: "Cocked" rod bolts
Replies: 9
Views: 676

Re: "Cocked" rod bolts

Big end has simply deformed and taken a set, despite the cap sitting 'square' Aluminium, even forged, remains quite malleable ..... despite the substantial age Other Brit manufacturers went over on some models to an Alum rod with a forged steel cap, which would suggest the caps however designed in A...
by BCjohnny
Sat Sep 26, 2020 3:33 am
Forum: Engine Tech
Topic: Connecting Rod Tech.
Replies: 19
Views: 978

Re: Connecting Rod Tech.

The radii used at the bolt head spot face are often too small. Seen many cracks/failures originate from that area. When I used to mess with the ubiquitous restricted oval class Pintos, the square broached std rod bolt shoulder never filled me with confidence at 7k+ Had a small Herbert surface grind...
by BCjohnny
Wed Sep 23, 2020 7:20 am
Forum: Engine Tech
Topic: Connecting Rod Tech.
Replies: 19
Views: 978

Re: Connecting Rod Tech.

Highest stress is in the bolts
Always been an advocate of 'serrated' rod / cap designs, interlocking

While it doesn't completely eliminate the shear loads on the bolt, it at least vectors them through, say 45 deg, or such
by BCjohnny
Mon Sep 21, 2020 5:24 am
Forum: Engine Tech
Topic: Difference between IDA & IDF Webber Carbs?
Replies: 35
Views: 1151

Re: Difference between IDA & IDF Webber Carbs?

Agree with mostly what's been said, one thing I'm not sure has been mentioned but ...... The IDA is physically a bigger carb than the IDF, bore centreline being about 4 3/4" / 3" respectively IIRC One may 'fit' the tunnel ram 'better' than the other, flow wise I know you're not running one but if yo...
by BCjohnny
Mon Sep 21, 2020 4:57 am
Forum: Engine Tech
Topic: Reducing cam bore ID in an aluminum cam pulley?
Replies: 15
Views: 470

Re: Reducing cam bore ID in an aluminum cam pulley?

While a 'shim' might get you there, anything less than boring and sleeving is a bodge If this is the engine you've detailed on here recently, and just spent I'm guessing thousands on, I can't believe you willing to risk all that for $150 Or find a company that can actually supply on spec parts ........
by BCjohnny
Sun Sep 13, 2020 5:02 am
Forum: Vintage/Classic/Historical Engine Tech
Topic: Intake and exhaust manifold fabrication for a small 6-cyl
Replies: 14
Views: 440

Re: Intake and exhaust manifold fabrication for a small 6-cyl

P.S. - if it were my project, it would be an ideal test for something I've always wanted to do for one of these - building an IR intake for three of the smaller SU carbs. Agree, the 90-degree with the Holley would look more period-correct ....... 'murrican, while the SUs would definitely be 'furrin...
by BCjohnny
Sat Sep 12, 2020 8:02 pm
Forum: Vintage/Classic/Historical Engine Tech
Topic: Jeep in a crate
Replies: 11
Views: 458

Re: Jeep in a crate

Ken_Parkman wrote:One of the enthusiasts has had a standing major reward for one since probably the 80's, and it has not been claimed as of the books writing.

Not unlike the 'buried Burmese crated Sptfire myth' doing the rounds a while back ...... lol
by BCjohnny
Sat Sep 12, 2020 7:52 pm
Forum: Vintage/Classic/Historical Engine Tech
Topic: Intake and exhaust manifold fabrication for a small 6-cyl
Replies: 14
Views: 440

Re: Intake and exhaust manifold fabrication for a small 6-cyl

With a 153624 firing order you'll likely want the following ...... but the siamesed ports won't help The exhaust is easiest to deal with first , combine the three front 123 and three rear 456 cylinders together into one pipe each, and the combine those two pipes into one single to mate to the exhaus...