Another piston question

Topics Last Day Last Week Tree View    Getting Started Formatting Troubleshooting Program Credits    New Messages Keyword Search Contact Moderators Edit Profile Administration
Model T Ford Forum: Forum 2005: Another piston question
Top of pagePrevious messageNext messageBottom of page Link to this message  By Mike Morse on Sunday, March 09, 2008 - 10:16 pm:

I'm hopefully going to buy pistons within the next month or so and had been planning to go with the domed aluminum. The engine will be going into a '24 tudor sedan, a member of the heavyweight club. After seeing the threads about slowing down on hills and many references to car weight I'm having second thoughts.

Like most of you I have a budget. But, with a desire to travel at a reasonable speed (high gear up typical hills) am I being short-sighted trying to save myself $350 by going with domed pistons with a standard high head? Should I really plan on getting a Z-head?

If I go with the domed pistons now, can I change out the pistons easily with the engine in the car?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mack Jeffrey Cole on Sunday, March 09, 2008 - 10:34 pm:

Yes, you can change out the pistons in the car even with a 3 dip pan.If you have upgraded to a 4 dip pan,which if you aint,it is a good thing,changing out the pistons will be a piece of cake.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Nelson Jones on Sunday, March 09, 2008 - 10:36 pm:

I have 060 over domed pistons with a stock head (surfaced for clean up only) in a oak bodied panel which is pretty heavy. Stock rear end ratio with a warford & ruxtell. I can run 45 on flat ground which is legal for short runs on the interstate (Crossing the Mississippi River at St Louis). Works for me. Nelson


Top of pagePrevious messageNext messageBottom of page Link to this message  By David Boe on Sunday, March 09, 2008 - 10:37 pm:

Mike, I had the same dilemma about a year ago. I posted the same question on the forum and was told that the dome pistons will only raise the compression ratio about a half point. You could always change them out later I guess if you wanted to add a high compression head. What I did was go with the regular pistons then several months later I purchased a high compression head. there is a guy that advertises them in the MTFCA magazine for $300 I believe. I could never reach the guy and ended up getting one of the vendors to match his advertised price for one.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Anthony Bennett - Australia on Sunday, March 09, 2008 - 10:42 pm:

Hi Mike,

Pistons are easy enough to change with the engine installed just pull the Radiator/head/inspection cover but you might want to hone the block which is a bit messy. As mentioned in other threads the clearance can be an issue... I have done this operation on a car that had too little room for it's new pistons.

My humble opinion is that you read the tech info presented by the blokes from Tulsa... they talk about the chamber shape being quite important. I reckon you could make up your mind from there. It's only money anyway:P


Top of pagePrevious messageNext messageBottom of page Link to this message  By jack daron-Indy. on Sunday, March 09, 2008 - 10:54 pm:

Buy the head and regular pistons. Then you only have to change them (pistons or head ) once.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mike Morse on Monday, March 10, 2008 - 08:09 am:

Great, thanks to all for your input. My engine is out of the car (which is currently a pile of rusted metal) and I just had the block & head resurfaced, rebabitted, crank ground/polished, and cylinders and valves honed. This will be the best opportunity to get it right. Glad to hear though that I could still change them out without needing to pull the engine.

My T money is my "play" money so I've got to pick and choose carefully. I'll research the testing results, but I'm now leaning on going with flat pistons and standard head now, and after the car is on the road save up and buy the Z-head.

Nelson- I'm not expecting too many problems on the flat ground. How does your T do pulling the hills? Are you always in low gear?


Top of pagePrevious messageNext messageBottom of page Link to this message  By James A. Golden on Monday, March 10, 2008 - 09:44 am:

Domed pistons raised my compression ratio from 50 to 75 psi. The engine was rebuilt at the same time and some of the raise was from a shaved head and block top.

The difference in top speed was more pronounced. It went from 40 to 70 mph and the T was never opened up full, due to stopping again or likely rolling over from the quick steering or a blowout.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mike Morse on Monday, March 10, 2008 - 10:01 am:

James, that's a pretty significant increase in compression and speed. These are the experiences that cause me to go back and forth on this decision.

Any other '23-'25 tudor sedan owners out there? What do you guys have in your engine and how does your car do on average hills?

I live in Maine near the coast where it is relatively flat, but we do have plenty of decent hills around. Maybe I'm making too much of this...


Top of pagePrevious messageNext messageBottom of page Link to this message  By Bob Sacchi on Monday, March 10, 2008 - 10:58 am:

James, you were able to do 70 MPH with the Z head? Wow!

The best I could do with a Z head, Stipe 280 cam, high volume intake and straight-thru NH was 60 MPH, and that was downhill....

(BTW, I'll never do that again!!!!! :-) )

Bob


Top of pagePrevious messageNext messageBottom of page Link to this message  By Bob Sacchi on Monday, March 10, 2008 - 11:00 am:

James, I just realised that you said "domed pistons", not "Z head"....

Read twice, post once......sorry

Bob


Top of pagePrevious messageNext messageBottom of page Link to this message  By James A. Golden on Monday, March 10, 2008 - 01:43 pm:

Bob, you are correct this time, no Z head, but I do have one that I may try on another engine.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mack Jeffrey Cole on Monday, March 10, 2008 - 08:34 pm:

70 mph in a T? I know we see these fiqures all the time and some do it regular and aint had no trouble.And for that I am thankfull.But aint no way this fat boy is going no 70 in a T.I aint got what it takes to do it.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Nelson Jones on Monday, March 10, 2008 - 09:41 pm:

Mike I have never been in any big hills. Just some mo. ozark hills. Never had to go to low if I could get a run. If I turn a corner & encounter a hill then I will be in low. Depending on the grade & length of the hill. I do not think I have to use low abnormably. Nelson


Posting is currently disabled in this topic. Contact your discussion moderator for more information.
Topics Last Day Last Week Tree View    Getting Started Formatting Troubleshooting Program Credits    New Messages Keyword Search Contact Moderators Edit Profile Administration