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05-20-2019, 04:24 PM | #21 | |
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Re: Isky 3/4 Max 1 Camshaft
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05-20-2019, 05:35 PM | #22 |
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Re: Isky 3/4 Max 1 Camshaft
Thanks again and speaking of stock heads and compression, this is most likely how Ford obtained a 7.5 CR on the 52-54 and the higher horsepower as well. The 6.8 on my Mercury is quite low and of course is best suited for a blown engine ;-). I have a degree wheel and this was required to time and modify the rotory intake valve plate on 2 stroke Rotax engines. The core with the EAB is possibly a 255, a Ford Reman engine from years ago but is riddled with cracks including through the valve train but it has a good crank and many other items including manifolds that fit my Merc.
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05-20-2019, 05:45 PM | #23 |
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Re: Isky 3/4 Max 1 Camshaft
How much does one dare mill the heads? Not as concerned as much about the thickness of the head and what is left but the valve flow passages or is it to the point of measuring the depth of these before and matching after milling by machining these out or is this actually not that critical compared to reducing the squish area directly above the piston? How about milling the top of the block down as well or is this a waste of time and only required for a warped or damaged surface?
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05-20-2019, 05:58 PM | #24 | |
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Re: Isky 3/4 Max 1 Camshaft
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https://www.tildentechnologies.com/C...rformance.html It will be interesting seeing the comparison of the OEM and the Isky specs I found and posted. |
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05-20-2019, 07:54 PM | #25 | |
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Re: Isky 3/4 Max 1 Camshaft
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Most shops can mill the heads now days but VERY few have the cutters to flycut the domes and over the valves and this will have to be done if you mill .080 which is the most I recommend. This work is quite expensive even if they can do them. You will probably be over half the cost of new heads. Even if you just take a minimum off to clean up, you will have to clay the pistons and valves on all cylinders for proper clearance. Do not mill the block unless it is warped or damaged. |
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05-20-2019, 08:06 PM | #26 |
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Re: Isky 3/4 Max 1 Camshaft
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https://www.fordbarn.com/forum/showt...7982&showall=1 Of course a forum called Fordbarn would be a good source! |
05-28-2019, 02:38 PM | #27 |
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Re: Isky 3/4 Max 1 Camshaft
The cost of milling the heads here would be less than purchasing from the United States so this is most likely the most logical option! Living in the Snow Mexican republic of Canuckastan means I'm dealing with (if I'm lucky) a $0.74 dollar plus exchange surcharges and this applies to both the item and shipping! Can somebody tell me what the real difference is between the 8CM and perhaps EAB heads? The newest of the flatties had a reported CR of 7.5 compared to my aniemic 6.8 which in reality is probably lower as others have mentioned. The C8CM heads are still on my Mercury and in the future I'm forced to pull them to adjust my valve clearance!! Adjustable $h!t lifters can be adjusted by removing the intake but this will be a TOTAL waste of time due to creeping so I'm forced to remove the lifters, remove the adjuster bolt and compress it in a vice to increase thread resistance and there is not enough room to lift them out unless I remove the heads, remove the valve guide retainer and lift the valves. I will NEVER use these again! Other than a degree wheel and figuring out the duration of the cam, did Ford ever stamp an ID number on their camshafts? I have an EAB core heavily infested with cracks and it was one of those Ford authorized rebuilds so there is no guarantee the camshaft is an original EAB cam.
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05-28-2019, 02:50 PM | #28 | |
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Re: Isky 3/4 Max 1 Camshaft
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To help you solve the loss adjuster thread issues when i run into that problem i simply clean the threads with brake cleaner to get rid of any oils i then use red Locktite placing a drop of Locktite on the adjuster thread at the location of the lower and upper thread and then reinstall the adjuster. Now after you have your clearance set the Locktite will hold the adjuster perfectly. It will take some effort in the future to move the adjuster for future adjustments when needed but its not difficult and you will find it will solve your problem. Ronnieroadster
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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 |
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05-28-2019, 03:03 PM | #29 |
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Re: Isky 3/4 Max 1 Camshaft
Every cam regardless of brand/mfr should at least be degree-checked at a minimum. Most will be "nominally" correct, if you find it way off it needs to be addressed.
We check every one we install and go as far as modifying the cam AND the cam gears to accept a SBC/BBC cam "pill", this allows the cam to be moved a fair amount! These pills come in 0*, 2*, 4*, 6*, and 8*. Thanks, Gary in N.Y. P.S. Here's a shot (again) of a finished cam/cam gear, not really all that difficult to do!
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05-29-2019, 07:13 AM | #30 |
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Re: Isky 3/4 Max 1 Camshaft
We milled the block back in the day when our race car was torn down at the end of a race to be sure it was stock !! Just saying.
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05-29-2019, 07:41 AM | #31 |
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Re: Isky 3/4 Max 1 Camshaft
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05-29-2019, 08:06 AM | #32 |
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Re: Isky 3/4 Max 1 Camshaft
One thing you should be aware of is: The compression ratio charts should be taken with a grand of sand. They vary all over the place. Measure them.
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05-29-2019, 01:24 PM | #33 |
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Re: Isky 3/4 Max 1 Camshaft
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05-29-2019, 05:59 PM | #34 |
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Re: Isky 3/4 Max 1 Camshaft
No, he meant what he said. The old saying goes as you mention but he means a whole beach full of sand. In other words, charts are meaningless except for bench racing. They give a lot of micro info that is useless in the real world.
The only way to really know is to measure the chamber with a burette tube and some juice WITH THE HEAD ON and if you are going to this extent, you have to have measured the stroke with a dial indicator to get it to .001 TIR. On a street engine if you are off chamber to chamber by 1/2 cc, you won't feel it in the seat of the pants but on an all out engine it could be the difference between 1st and 2nd place. |
05-29-2019, 07:27 PM | #35 |
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Re: Isky 3/4 Max 1 Camshaft
I have a method for measuring the compression out to several decimal places. I posted it here but nobody waz interested. It only works when the engine is on a stand , so you can level it. The process goes like this: accurately measure the size of the combustion chamber. Place a used gasket on the block and install the head tighten it down. Make sure the piston was on the compression stroke and a quarter inch from the top. Now screw the measuring gauge into the spark plug hole. Now for the results. Pore into the new gauge the amount of fluid for the volumn of the chamber. Now move the piston up to TDC. no fliud in the gauge, yet. Now add fluid into the new gauge untill to regesters on the gauge. By rocking the piston you can find TDC and the amount of fluid you had to add to the chamber to get the exact size of the combustion chamber. This usual requires about 15 more cc's.
For gustamating the CR I just add 15 cc's to the chamber volume and use it/ So If you have a 65cc Edelbrock head, then the chamber is aprox 80 CC and the CR is much lower than you thought. When I waz younger I did allot of "Stuff" like this. |
06-04-2019, 11:36 AM | #36 | |
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Re: Isky 3/4 Max 1 Camshaft
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06-04-2019, 01:17 PM | #37 |
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Re: Isky 3/4 Max 1 Camshaft
56mark, do you have JWL's book? That is a good place to start. So is Ron's.
VanPelt has Ron's book (and JWL's book as well, Flathead Facts). https://www.vanpeltsalesstore.com/L-...ran_p_607.html |
06-04-2019, 04:48 PM | #38 |
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Re: Isky 3/4 Max 1 Camshaft
Thanks for posting the link. I'll also be ordering those books.
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06-04-2019, 05:40 PM | #39 |
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Re: Isky 3/4 Max 1 Camshaft
John has done just that, and with the Max #1 cam. And is the best book out there.
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06-04-2019, 10:13 PM | #40 |
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Re: Isky 3/4 Max 1 Camshaft
JWL's book is an absolute must read for any flathead fan as well as Ron's.
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