| Slant Six Forum https://slantsix.org/forum/ |
|
| how much can you take off the head https://slantsix.org/forum/viewtopic.php?t=10057 |
Page 1 of 1 |
| Author: | moparfreak [ Sun Aug 08, 2004 7:52 pm ] |
| Post subject: | how much can you take off the head |
i read some wear that taking 50 thou off your head should give you 9-1 compression it was a search i did on google and i am wondering how much you can plain the head on a 225 bfore you start running the risk of the valves hitting the pistons i'll see if i can find that article again so some of you can read over it |
|
| Author: | Will [ Sun Aug 08, 2004 9:33 pm ] |
| Post subject: | |
Stock motor stock cam .100 off head and .100 off block I used to run that all the time. you can even get away with a bigger cam without hitting. Will |
|
| Author: | moparfreak [ Mon Aug 09, 2004 7:31 pm ] |
| Post subject: | |
ok thanks will that is good to know |
|
| Author: | Eric F. [ Mon Aug 09, 2004 8:00 pm ] |
| Post subject: | Compression |
I took .115 off the head and used .o6o over wolverine pistons and got 9.1:1 compression oh forgot the ford valves not sure if that helped or hurt anything but makes for better breathing. |
|
| Author: | Will [ Tue Aug 10, 2004 9:44 pm ] |
| Post subject: | |
Erick it is good to know that there is anouther slanter so close to home. that makes at least 5 of us around here! Will |
|
| Author: | moparfreak [ Wed Aug 11, 2004 10:22 am ] |
| Post subject: | |
ok i'm trying to figure out how i can get a 9-1 compression ratio with stock valves and pistons and have heard the stock compression ratio is 8.4-1 for the slant now i don't know if this is accurate but if so how come eric f. took 115 thou off and only has 9.1-1 compression i'm only thinking of removing 50 or 60 thou myself |
|
| Author: | moparfreak [ Mon Aug 16, 2004 1:59 pm ] |
| Post subject: | |
so what is the stock compression ratio for the sixes mine is old enuf to not have a hydrolic setup in it but new enuf that i don't have the plug seals either so my guess would be 80 but that could be wrong |
|
| Author: | Dart270 [ Mon Aug 16, 2004 2:10 pm ] |
| Post subject: | |
Stock comp is rated at 8.4:1, but the deck height and head chamber vol are almost always bigger than the specs, so stock is usually around 8.0:1. 0.090" off a typical stock motor (block or head or combination) will take you to around 9:1. Measure your specs above, then you can compute it and figure how much to remove. Lou |
|
| Author: | moparfreak [ Tue Aug 17, 2004 1:35 pm ] |
| Post subject: | |
alright so taking 0.060" off the head won't give me the 9-1 i was hoping it might i don't want to take much more off it even though i can it is going to be a daily driver and i don't want to make it less durable the it would be stock |
|
| Author: | mnecaise [ Tue Aug 17, 2004 2:56 pm ] |
| Post subject: | |
You're safe taking more than that off the head if you want. The head on a /6 is unusually thick. The head was designed to mount on a aluminum block (60-62?) which had no top deck. Because of this, the head had to be more rigid. In later re-designs, they never removed the extra metal. So, that's why everyone says it's safe to remove 0.100 from the head... Supposedly there's that much extra metal in the iron block as well. Probably had to do with expansion & contraction coefficients needing to be the same. |
|
| Author: | moparfreak [ Thu Aug 19, 2004 10:47 am ] |
| Post subject: | |
yea but i still want to be able to run on regular fuel which around here is only 87 to 89 octane depending on where you get it |
|
| Author: | Al T [ Thu Aug 19, 2004 3:08 pm ] |
| Post subject: | Static Compression Excel Spreadsheet |
I did this up when working on my engine http://www.slantsix.org/forum/viewtopic ... ompression or search for 'compression' by author 'Al T' |
|
| Author: | moparfreak [ Thu Aug 19, 2004 10:38 pm ] |
| Post subject: | |
thanks for the link it's rather intresting |
|
| Page 1 of 1 | All times are UTC-08:00 |
| Powered by phpBB® Forum Software © phpBB Limited https://www.phpbb.com/ |
|