Forum: Model A (1928-31)
03-22-2024, 10:05 PM
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Replies: 5
Views: 576
Re: what is this? mag drive?
It is an attempt at a side drive magneto
The gear is properly sized for a mag with 2:1 gear reduction or a governor
Most aircraft mags are 2:1 or crank speed.
J
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Forum: Model A (1928-31)
03-14-2024, 10:06 AM
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Replies: 21
Views: 7,209
Re: Model B engine advantages?
Considering this thread is 10 years old it still holds true with the exception of Terry Burtz accomplishing seemingly the impossible feat
J
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Forum: Model A (1928-31)
03-11-2024, 03:26 PM
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Replies: 16
Views: 1,101
Re: Donovan 4 Cylinder
So yes Terry
The diamond blocks have been used
I am someone will have an issue and that will change
J
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Forum: Model A (1928-31)
03-11-2024, 12:42 PM
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Replies: 16
Views: 1,101
Re: Donovan 4 Cylinder
Chris
The V4 classes are Vintage strictly meaning original blocks of pre 1935 manufacture
You can run the Donovan in the displacement classes but the architecture is a disadvantage
J
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Forum: Model A (1928-31)
03-09-2024, 09:33 AM
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Replies: 16
Views: 1,101
Re: Donovan 4 Cylinder
This was a couple years ago, "D" block and a Arnold Birner head a friend was making.
I did a build on another "D" block made for the Birner head, without intake ports or valve chambers.
J
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Forum: Model A (1928-31)
03-08-2024, 05:06 PM
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Replies: 29
Views: 2,089
Re: high conpression head ??
Yes
There is a balance point between C/R and airflow
This has been demonstrated on flow bench testing
All moderate c/r heads will probably perform well within reason
Spark plug placement is...
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Forum: Model A (1928-31)
03-04-2024, 09:08 PM
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Replies: 30
Views: 2,078
Re: Safety cage?
Hmm,
Adding a cage to any street car is not recommended, a properly designed and built cage will become dangerous unless you wear a helmet.
I have looked at a couple sedan type model A's that had...
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Forum: Model A (1928-31)
03-02-2024, 10:36 AM
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Replies: 22
Views: 973
Re: Klein Tools
If used correctly the DC indirect amperage can be nice, but reminds me of a job some years ago. A major distribution center, I had just installed an auto scanning manifesting system. It used a PLC...
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Forum: Model A (1928-31)
02-29-2024, 08:20 PM
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Replies: 16
Views: 1,000
Re: Lion Speed Head?
I have heard rumors of Lion heads detonating, that is how the one I have was acquired.
Using the proper sparkplug and limiting the advance does wonders.
I doubt seriously the sharp edges could...
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Forum: Model A (1928-31)
02-28-2024, 12:22 PM
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Replies: 16
Views: 1,000
Re: Lion Speed Head?
Currently running an original version
Good low end torque falls flat pretty rapidly at higher speed
J
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Forum: Model A (1928-31)
02-26-2024, 10:24 AM
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Replies: 25
Views: 1,581
Re: Pre Osha
You are in big trouble if you think Osha is a town in Wisconsin
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Forum: Model A (1928-31)
02-24-2024, 03:58 PM
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Replies: 12
Views: 694
Re: Which Headers
Good question
You will get opinions
Logic would suggest a tube header will just offer better performance than a cast manifold type
This is not always true
Besides a 10% performance difference...
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Forum: Model A (1928-31)
02-23-2024, 12:35 PM
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Replies: 10
Views: 1,013
Re: Riley ?
So I have one going together currently
It is one of the first run of castings
The machine work is done well everything lines up and fits nicely
We did find a small issue in the water jacket and...
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Forum: Model A (1928-31)
02-22-2024, 12:57 PM
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Replies: 17
Views: 852
Re: Best Source For B Motor Parts
So a couple comments here;
Yes inserts are not new there was a Volvo rod bearing from ‘40’s that makes a great fit into modded B rods
Finding them is the challenge
The devil is in the details ...
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Forum: Model A (1928-31)
02-21-2024, 11:11 PM
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Replies: 17
Views: 852
Re: Best Source For B Motor Parts
Uhh, blown out by the pressure?
another old wives tale, if done properly is not an issue, I run 100+psi pressure at 7000 rpm, never moved an insert.
Cast in bearing not done properly will suffer...
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Forum: Model A (1928-31)
02-21-2024, 10:53 PM
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Replies: 17
Views: 852
Re: Best Source For B Motor Parts
If you have the drilled crank, has the block been prepped for pressure oiling?
part of the process is to open up the oil passages to flow more oil to the crank and block off the front center...
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Forum: Model A (1928-31)
02-20-2024, 08:08 PM
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Replies: 49
Views: 3,179
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Forum: Model A (1928-31)
02-20-2024, 08:08 AM
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Replies: 49
Views: 3,179
Re: Model A cam ground to "B" profile
pneumatic springs have been around for some time now, still opened by cams.
variable cam timing has also been around for some time, is in many production cars today.
I read years ago about...
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Forum: Model A (1928-31)
02-18-2024, 02:01 PM
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Replies: 10
Views: 1,013
Re: Riley ?
The Riley heads are very good, make good power and pretty stout.
But, there were many castings sold not machined and that left some to be machined with questionable techniques. I have had a couple...
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Forum: Model A (1928-31)
02-18-2024, 11:23 AM
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Replies: 6
Views: 583
Re: What cranks are these?
If those are not too far undersize it could be good run for a grinder to do.
If too far under, a good start for mailbox posts...
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Forum: Model A (1928-31)
02-15-2024, 01:14 PM
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Replies: 40
Views: 2,840
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Forum: Model A (1928-31)
02-13-2024, 11:31 AM
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Replies: 63
Views: 5,137
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Forum: Model A (1928-31)
02-12-2024, 11:33 AM
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Replies: 49
Views: 3,179
Re: Model A cam ground to "B" profile
Jeep
Let me ask you a question
Do you salt and pepper a steak at a restaurant before tasting?
Don’t get me wrong asking questions is great, the secret to racing is to ask questions
The...
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Forum: Model A (1928-31)
02-11-2024, 10:53 AM
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Replies: 22
Views: 1,732
Re: counter balanced crank
The application is a 1991-2002 Saturn 1.9 L rod bearing.
CB1623P bore 1.9761 -1.9766 0.8 wide journal 1.849 - 1.8505
available in std, .010 and .020 undersize
John
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Forum: Model A (1928-31)
02-09-2024, 01:21 PM
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Replies: 49
Views: 3,179
Re: Model A cam ground to "B" profile
Hmmm
So I just had this conversation this week with a friend
He sent me some timing specs that he measured
Of the timing specs only the 050 numbers made any sense
Even after discussing the...
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