Bolt in motor (I screwed myself)

[05stroker]

Heh...I was locked advanced but I will be doing the same thing as you retarding my cams somewhere between 4-8 degrees. Manuel suggested the same thing to me.

After looking at the heads and my dish pistons more I don't think we will have issues. They would be hitting the flat area around my dished Manleys now if it was an issue.

 

[05stroker]

More to add to the above.

 

[LAStang1234]

Just saw this Billy! Sorry to hear man!!

 

[05stroker]

New pistons showed up yesterday! I am hoping to finish the heads in the next week or so.
http://www.s197forum.com/forum/showthread.php?t=108899

I have the second set of main bearings also so I can upgrade the rear main to a full unit. I will have to assemble everything and check clearances after milling the heads to see if I need an exhaust relief before coating the new pistons. Not sure if I am going to oring the block and use copper gaskets or just use stock again yet.

New pistons



New rear main setup



Stock main setup

 

[BruceH]

Were you having problems with the thrust bearing? I'd do a .075" exhaust valve relief. Are those pistons 1.2 compression height or are they 1.220 stock that will be milled down?

 

[05stroker]

Were you having problems with the thrust bearing? I'd do a .075" exhaust valve relief. Are those pistons 1.2 compression height or are they 1.220 stock that will be milled down?

No, about the trust bearing, I just thought while I was there ya know.

The pistons are the 595030 with 1.220. I have not thought of milling the pistons down. Why do you say that? This is the first I have heard of that. I used the 18cc version of this piston at 1.220 on every motor I have ran so far.

http://www.manleyperformance.com/niche/ford_54_pistons.shtml

 

[BruceH]

No, about the trust bearing, I just thought while I was there ya know.

The pistons are the 595030 with 1.220. I have not thought of milling the pistons down. Why do you say that? This is the first I have heard of that. I used the 18cc version of this piston at 1.220 on every motor I have ran so far.

http://www.manleyperformance.com/niche/ford_54_pistons.shtml

You have a stroker, correct? 3.75 stroke with a 5.850 rod? The correct compression height would be 1.200"

Edit: Your link shows them as stroker pistons with a 1.200 ch.

 

[05stroker]

You have a stroker, correct? 3.75 stroke with a 5.850 rod? The correct compression height would be 1.200"

Edit: Your link shows them as stroker pistons with a 1.200 ch.

Yes, that is correct, sorry. I do and have always had the 1.200 CH for the stroker pistons on the -18cc and the flattops I have now. Well, except for one time, and that didn't end well with my stroker crank and a 6500 rpm pull! LOL

 

[05stroker]

I'd do a .075" exhaust valve relief.

I am going to assemble the motor and check clearances this time. What would you say the recommended minimum PTV clearance should be?

 

[BruceH]

I am going to assemble the motor and check clearances this time. What would you say the recommended minimum PTV clearance should be?

I don't know. A wild guess would be .050". I know that my flattops have a .075" exhaust valve clearance. The deck height is standard .008" and I'm running cams that push the stock valves down .550" on the exhaust side. I don't have any issues.

My last motor also had flat tops and a .003" deck height. IIRC the max lift was .535. The pistons had an exhaust valve relief and once again no issues.

I've read that anything under .500" doesn't need any piston reliefs with stock .008" deck height but I haven't measured it.

 

[05stroker]

I don't know. A wild guess would be .050". I know that my flattops have a .075" exhaust valve clearance. The deck height is standard .008" and I'm running cams that push the stock valves down .550" on the exhaust side. I don't have any issues.

My last motor also had flat tops and a .003" deck height. IIRC the max lift was .535. The pistons had an exhaust valve relief and once again no issues.

I've read that anything under .500" doesn't need any piston reliefs with stock .008" deck height but I haven't measured it.

I have 127550 cams now and a .008 DH with the 18cc 1.200 dish pistons I posted the pics of above , the outer lip on the piston would represent a flattop piston. The only reason I am thinking of a valve relief is that the heads will need to be milled to keep the cc in the CC where I want it for the CR I am aiming for. The current pistons should be at 11.6 CR with 51cc CC and .036 compressed head gaskets. Also if I use the copper head gaskets and Oring the block , the min. head gasket thickness would be .043 and I would have to make up for that as well.

 

[lostsoul]

really sorry to hear billy. This has not been a good year for sure =-/

 

[05stroker]

really sorry to hear billy. This has not been a years year for sure =-/

I'm not to bummed. The last motor worked very well for 16 mo. I am selling the N2O kit I never used and I have a monster brewing here. 11.0-11.6 CR with 23-25 psi and some hogged out heads on E85 will be very fun!

 

[BruceH]

I have 127550 cams now and a .008 DH with the 18cc 1.200 dish pistons I posted the pics of above , the outer lip on the piston would represent a flattop piston. The only reason I am thinking of a valve relief is that the heads will need to be milled to keep the cc in the CC where I want it for the CR I am aiming for. The current pistons should be at 11.6 CR with 51cc CC and .036 compressed head gaskets. Also if I use the copper head gaskets and Oring the block , the min. head gasket thickness would be .043 and I would have to make up for that as well.

It's going to be a beast. Maybe you should keep the stock head gaskets to use as a fuse. All of the extra compression is really going to jack up the power with e85. Then again copper and orings will really hold it in. What a tough choice, lol.

My Mahle flat top motor has 1cc valve relief. That's the Mahle figure and it's probably fairly accurate as the relief is large. The Diamond flat tops list .06cc and they are the ones with a .075" relief. It's pretty small compared to the Mahle.

I'd say go ahead and have the reliefs cut in because you never know what will happen in the future and it would suck to pull the motor apart to do something you can do right now. Maybe you will want larger cams or special trick heads that are milled to the minimum for a few more hp when you get tired of the 900+ this motor is going to make, lol.

 

[Department Of Boost]

Piston to valve (PTV) clearance:

When I was building Ducati motors we ran .040" as a maximum clearance. This is how we set customer motors up. And keep in mind this is on motors with titanium rods that DO stretch at high RPM (12,000+). And big bores (108+mm) so there was more piston rock than you will see in a Mod motor. Never, ever had a problem.

On our own personal race bikes we would run the PTV clearance down as far as .032". Same with the piston to head clearance. Never once had a problem with that either. Granted, after a weekend at a place like Daytona there would be slight reference marks from the valves and head on the top of the piston. You are WOT for a long time at very high RPM's there though. Never had a failure, bent valve, etc.

.075" is about a mile of clearance.

 

[05stroker]

I seem to remember that .040 was the number I was looking for. I cannot remember where I got that from though. I will assemble the motor and check clearances before coating and then there will be no doubt what the PTV is.


Another thing to conceder is the fact that I am setting up the cams at 4* retard this time as well. Would that make the exhaust valve closer or further away from the piston.

 

[JEWC_Motorsports]

This build is taking too long. Get on with it already lol.

 

[05stroker]

This build is taking too long. Get on with it already lol.

No need to be in a hurry right now. I will be ready to let you look at the rear bumper soon enough.

 

[fdjizm]

seriously, cock tease.

 

[05stroker]

seriously, cock tease.

Its a "Southern Thing", you wouldn't understand! LOL