|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
10-05-2022, 12:17 PM | #21 |
Senior Member
Join Date: Feb 2021
Location: Perry Mo.
Posts: 485
|
Re: The perfect "street engine"
Ron, I'm trying to build the perfect street engine you speak of. Here is where I'm currently at in the process. 1953 low mile mercury . Cleaned and checked for cracks, board .030 , Three ring pistons ,Crank turned .010 .010 ,had hard seats cut in for the exhausts, running the stock Mercury cam ,stainless valves, Melling oil pump, new aluminum and steel timing gears . The distributor is a old dual point conversion I found ./ I ported the block but opted not to relieve it. I port matched the original Fenton headers to the block and plan on doing the same to the intake when I find one I like. Leaning towards a slingshot and a pair of 1 1/16" Holley's. I'm currently looking for a set of EAB heads and would like to hear more about this angle milling you have spoken of in past threads (what angle and how much) as aftermarket heads have reached the stratosphere in price. One question I have is, are hollow lifters that much better then solid adjustable ? Another one is are any of you running the modern front seal? I will follow this thread as far as it goes thanks guys , Tim
|
10-05-2022, 05:37 PM | #22 |
Senior Member
Join Date: May 2010
Location: SPEEDWAY INDIANA
Posts: 4,148
|
Re: The perfect "street engine"
ron I have detroit 3-71 blower i would donate just for shipping
|
Sponsored Links (Register now to hide all advertisements) |
|
10-06-2022, 03:18 PM | #23 |
Senior Member
Join Date: May 2010
Location: Chester Vt
Posts: 8,860
|
Re: The perfect "street engine"
Wow!! That's a good offer Bubba, but ny building days are numbered. Never finish the projects I have started. The 3-71 should work well on a small engine but the intake would be rare.
Angle milling is just another way to remove material from the area that will do the most good. The late heads are limineted in how much you can mill them do to the thincasting near the water outlet. I only mill them about.070" but that's on a stock head. now dwpwnding on the type of milling machine you have determines how difficult this is. The shop near me has a "Brock" with a 12' wheel. Al I have to do is put a shim on one side of the amt I want removed and that's It. I use .060" washers and then a .010" clean up pass. The only thing you have to do is measure the an't of cam lift first. If you need to clearance for the valves, do that at a 4deg angle it will remove less material. Now raising the compression is the only reason we're doing all this and reliving the block is probably the least profitable mofification you can do. The reason they relieve blocks is: When casting an alumonum head they lower the trandfer area th increase the CR. noe relieving the block is supposed to cure that. Stock heads have a better combustion chamber tham most aftermarket heads. Gramps.. Stop eating books and start reading them> G |
10-06-2022, 03:52 PM | #24 |
Senior Member
Join Date: May 2010
Location: Wa.
Posts: 5,409
|
Re: The perfect "street engine"
There are two PRIMARY reasons for relieving the block to maximum depth.
One is to shorten the fuel transfer path to the cylinder. The other is to shorten the flame front travel. The compression ratio is adjusted to the required value by adjusting the volume of the transfer area in the head. This works equally well on street engines as well as all out race engines. A couple of NASCAR engine builders figured this out back in the 50's. They were probably the first ones to get over one hp. per cubic inch out of a flathead Ford engine. |
10-06-2022, 07:31 PM | #25 |
Senior Member
Join Date: Dec 2010
Location: East Coast in CT
Posts: 1,529
|
Re: The perfect "street engine"
Adding to the thoughts on the The Perfect Street Engine I would look into a vacuum pump electric operated. Reducing crankcase pressures will increase output and at no cost in power grabbing when a good alternator is used to feed the needed voltage to run the pump.
Ronnieroadster
__________________
I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH Last edited by Ronnieroadster; 10-07-2022 at 12:42 PM. |
10-06-2022, 09:11 PM | #26 |
Senior Member
Join Date: May 2010
Location: now Kuna, Idaho
Posts: 3,779
|
Re: The perfect "street engine"
Sponsored Links (Register now to hide all advertisements)
|
10-06-2022, 10:22 PM | #27 |
Senior Member
Join Date: May 2010
Location: Chester Vt
Posts: 8,860
|
Re: The perfect "street engine"
Pete, One horsepower per cubic inch from a flathead back in the 5's????? At one time back in the 80's I went thrugh the Bville pits looking for a relieved block, and nobody had one and a good way to shorten the flame front would be to put the spark plug in the transfer area where it belongs.;
Gramps Maybe alittle nitro?? |
10-07-2022, 06:48 PM | #28 | |
Senior Member
Join Date: May 2010
Location: Wa.
Posts: 5,409
|
Re: The perfect "street engine"
Quote:
By the way, it is just a matter of math which can be found all over the internet. You have the car weight, frontal area, drag coefficient and speed, plug them in and get hp required. Putting the plug in the transfer area will cause uncontrollable detonation in a race engine. |
|
10-07-2022, 11:39 PM | #29 |
Senior Member
Join Date: May 2010
Location: Chester Vt
Posts: 8,860
|
Re: The perfect "street engine"
I agree with you on the early days when we all relieved our engines. I spen many hours doing so. However that was then and many of us had no idea what we were doing. Today is a different story,, we have more information. Some where the flow data I have somewhere puts the best transfer angle at around 12 degrees for better flow into the cylinder and that's aprox what the EAB head has. Why would putting the spark plug in the transfer area be a bad idea. That's where Grancore put theres. . now I could be wrong here, however, I have to consider all the information and put some of it to work on this engine. Crank assy is done and I'm working on the ports, and they are different?? Biggest problem is I can't get any compression. I wanted to use a wedge style piston (ALA 409)But couldn't afford it. Running out of time.\Gramps
|
10-08-2022, 05:18 PM | #30 | |
Senior Member
Join Date: May 2010
Location: Wa.
Posts: 5,409
|
Re: The perfect "street engine"
Quote:
Stick with what you know works and stay away from modern all out race stuff. Very few can afford that stuff anyway.. As far as plug location, go with data acquired by people that put millions into research on the subject. Plenty adaquate for street. Harley Davidson and B&S. Look at hp figures for the KR and the B&S junior dragsters. |
|
10-08-2022, 05:39 PM | #31 |
Senior Member
Join Date: May 2010
Location: Chester Vt
Posts: 8,860
|
Re: The perfect "street engine"
Good information Pete, unfortunately, some of my knowledge is pretty old, but I worked with JWL and we both moved our plugs to the center of the transfer area. He ran several tests with these heads, it in thebook. So I made a set as well, but havent had an engine to try them on. YET!!
|
10-09-2022, 09:35 PM | #32 | |
Senior Member
Join Date: May 2010
Location: now Kuna, Idaho
Posts: 3,779
|
Re: The perfect "street engine"
Quote:
Also note: In spite of all the modern technology, it is not anywhere one HP per cube! |
|
10-09-2022, 09:48 PM | #33 |
Senior Member
Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,320
|
Re: The perfect "street engine"
Like everything else, horsepower was a lot cheaper back in the day.
|
10-10-2022, 05:38 PM | #34 | |
Senior Member
Join Date: May 2010
Location: NJ
Posts: 6,181
|
Re: The perfect "street engine"
Quote:
|
|
10-10-2022, 06:42 PM | #35 |
Member
Join Date: Jul 2012
Posts: 93
|
Re: The perfect "street engine"
Is the 8cm cam a good choice for this build?
|
10-10-2022, 07:45 PM | #36 | |
Senior Member
Join Date: May 2010
Location: Wa.
Posts: 5,409
|
Re: The perfect "street engine"
Quote:
Anyone that spends 40K for a race engine is sure not going to tell anyone what he spent it for. I have never seen an article or a book on how to build an engine like the 777 had 3 of or what John Bradley, Whitey MacDonald, the Bean Bandits, Speedy Spiers or a dozen others had in their engines. All of those engines were naturally aspirated and got well over one hp per inch. There is a guy with a modern vintage style dragster right now that is getting well over 2 hp per inch from a blown FLATHEAD on fuel. You sure are not going to see a parts list for that one. The engine written up in HR is a healthy street engine at 249+ hp. There is another street flathead engine write up in the AERA magazine this month. These are good street engines but are not even in the same universe as a modern flathead all out race engine. |
|
10-10-2022, 07:47 PM | #37 |
Senior Member
Join Date: May 2010
Location: Chester Vt
Posts: 8,860
|
Re: The perfect "street engine"
Not sure what the timing specs of this cam is. But I'd look for a cam with less than 220 duratin and .350 lift. This will keep the torque in the driving range, I used the EAB/EAC cams.
G |
10-10-2022, 08:27 PM | #38 |
Senior Member
Join Date: May 2010
Location: now Kuna, Idaho
Posts: 3,779
|
Re: The perfect "street engine"
Ron, the engine in Hot Rod has special oversize cam bearings to give .470" lift. Duration is given as 270/280 deg. at .050 lift. But compression is only 9.2 to 1.
|
10-10-2022, 08:46 PM | #39 | |
Senior Member
Join Date: May 2010
Location: now Kuna, Idaho
Posts: 3,779
|
Re: The perfect "street engine"
Quote:
I'll bet that those roller cam bearings, the cam and the belt drive alone cost as much as a typical "healthy street engine"! |
|
10-10-2022, 08:49 PM | #40 |
Senior Member
Join Date: May 2010
Location: NJ
Posts: 6,181
|
Re: The perfect "street engine"
I'm going to try and find that HR article. I'm very curious about this motor.
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|