I do not see an oil filter or oil filter mount on the tight front side of the block. If it is actually not there, then the filter mounts to the intake manifold and it is an earlier F engine. I also do not see an oil fill tube on the right hand side of the engine, so it is not a very early F...
Seems Piston change in shape, increased compression. With Valve length the same, and believe only the VVT is a true interference engine. Would also indicate piston dome higher. No mention of change to heads' combustion chamber or length of rods..
So I suppose it depends on if your new pistons...
closed chamber and openchamber are the main differences, domed pistons would contact a closed chamber head and an openchamber head would have lower compression with flat top pistons
there was thought years ago about taking .1"?? off an openchamber head to help the compression with flat...
It’s a 61030. I need to get the head cleaned and checked for cracks. It’s pretty corroded. The end freeze plug was totally rusted through.
The pistons (100) don’t look bad. The cylinder walls have some surface rust but no signs of pitting, and no significant ring ridges that I can detect...
Jim, if you are contemplating a rebuild with a '75 2F Engine (Domed Pistons) and a 61030 OpenChamber Head, and you have to bore the cylinders, and domed pistons NLA, what do you do? I assume you go with flat head pistons, but what head do you look for?
I don't know for certain... I picked up the engine recently not knowing the year. I cleaned off the SN (2F 037791) and from the MUD Spreadsheet determined it was a 1975 Engine. I'm going with the assumption it's an openchamber with domed pistons. I'm just wondering if I should be thinking...
Bumping your compression (within reasonable limits) is a great way to increase low end torque.
If domed pistons are NLA as mentioned I would run the closed chamber head if you have one. If you run the closed chamber head and flat top piston you can still mill the head to achieve more...
I’m not trying to build a muscle car. I just want to build a respectable 2F with good low end torque. I understand that the openchamber heads with domed pistons have a lower compression than the closed/flat and we’re designed primarily for smog control. If I’m going to rebuild a 2F I want...
He is saying closed chamber heads are more efficient. Which you use with flat top pistons. Then you mill the head to raise compression. What year heads are closed chamber should be easy to find out doing a search, but I don't know personally. For such a setup you would run a sniper with timing...
Mark Whatley wrote this in 2006. Can anyone help me understand what Mark is saying about the trade off between using the ‘75 (“early”) head versus the “later” (years?) head to achieve higher compression?
I have a ‘75 2F I’m looking at rebuilding and I’m wondering if this comment from Mark...
I forget what head number i have, but i know it's off a Late F engine. Pretty sure it's the openchamber head you mention. Back in 2004 when i rebuilt the 2F block, i was able to find Federal-Mogul domed pistons and Total Seal rings, .050 over, for it. It bumped compression pretty well, had some...
It's been years since I was active in cruiserdom other than oit crewing with Canguro Racing but after my 1976 fj40 had been parked for 19 years I'm finally making progress in getting her back on the road. What I thought was simply a "rings didn't seat" issue on my motor with 2k miles on it...
Alright, done more research and have figured out some things and have more focused questions on the others that probably don't matter...
For domed (and open combustion chamber) vs. flat pistons (closed combustion chamber), it seems like the power output is probably pretty similar even though...
Another visual distraction before we head back into the rabbit hole. This is the last of the motors started at the original carport lab...
It’s an early 2F with the dome pistons and openchambered head.
The pistons for these motors have long been discontinued from Toyota, but I found a...
So the '77 motor has an openchamber head, and is supposed to have domed pistons to compensate. Are the MAF pistons domed? What's your compression? If there's a mismatch between head and pistons, I think the compression test will reveal it.
If the pistons are flat, an FJ60 head will restore...
61218 is the engine block casting date.
6 = 1976
12 = Dec.
18th day of month.
Yes, all the 75-80 US spec 2F have openchamber head, dome piston and low compression. Other markets get a 61010 head & flattop pistons for better performance.