 95mm pistons anyone?, JE forged part number |
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| Seabird |
 Oct 20 2014, 01:48 PM
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#1
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Member  Group: Members Posts: 165 Joined: 21-November 13 From: United States Member No.: 16,683 Region Association: South East States  |
Looks like I am in the engine rebuilding way at the moment. Finally got feed up with trying to figure out what was wrong with my engine/auxiliary systems so I pulled the motor this weekend.
Probably the last time out on track the motor dropped a valve guide. Found one broken secondary spring. And I still haven't pulled the driver side head! Fun fun. Ideally I would like to find quality 95mm pistons (allowed a 1.2mm over bore for the class I am preparing to run) and machine my cylinders to match. There does not seem to be a quality 95mm option on the shelf. (I know AA makes a 95mm piston & cylinder set; I am just not interested in buying it.) My question is: has anyone ordered custom 95mm JE pistons and are willing to share the part number? Alternatively is there a source for forged 94mm flat top pistons? All the forged pistons I can find are 96mm or bigger. Thanks, Miguel |
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| Mark Henry |
Oct 21 2014, 02:27 PM
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#2
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
You also could have gone 94 and had the crank done a hair longer stroke
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| ChrisFoley |
Oct 21 2014, 04:35 PM
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#3
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I am Tangerine Racing Group: Members Posts: 7,937 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None 
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QUOTE(Mark Henry @ Oct 21 2014, 03:27 PM)  You also could have gone 94 and had the crank done a hair longer stroke No, the rules allow 1.2mm overbore, but no change in stroke. |
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| brant |
Oct 21 2014, 05:21 PM
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#4
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914 Wizard Group: Members Posts: 11,641 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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QUOTE(Racer Chris @ Oct 21 2014, 04:35 PM) QUOTE(Mark Henry @ Oct 21 2014, 03:27 PM) You also could have gone 94 and had the crank done a hair longer stroke No, the rules allow 1.2mm overbore, but no change in stroke. I agree with chris |
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| Han Solo |
Feb 4 2015, 10:39 AM
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#5
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Member Group: Members Posts: 288 Joined: 30-September 13 From: Middle Tennessee Member No.: 16,456 Region Association: South East States |
QUOTE(brant @ Oct 21 2014, 05:21 PM) QUOTE(Racer Chris @ Oct 21 2014, 04:35 PM) QUOTE(Mark Henry @ Oct 21 2014, 03:27 PM) You also could have gone 94 and had the crank done a hair longer stroke No, the rules allow 1.2mm overbore, but no change in stroke. I agree with chris If this discussion is SCCA Solo... here's an interesting change for 2015 in DP. Per Appendix A for DP... Engines with 2-valves per cylinder: 1.00 x listed displacement (cc) Engines with 2-valves per cylinder are permitted a displacement change of +10% via bore/stroke changes only and with the weight formula accounting for the increased displacement. Which should super cede 17.10 ENGINE - DRIVE TRAIN... H. Block 1. The block may be rebored no more than 0.0472” (1.2 mm) over standard unless otherwise specified in Appendix A. So if my math is correct... if you replace OEM 94mm jugs with 96mm and keep the same stroke that's 1971cc to 2056cc with a 4.3% increase. Correct? But that prepared car would need to weigh in at 2056 lbs. |
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| brant |
Feb 4 2015, 11:45 AM
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#6
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914 Wizard Group: Members Posts: 11,641 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains
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QUOTE(Han Solo @ Feb 4 2015, 09:39 AM) QUOTE(brant @ Oct 21 2014, 05:21 PM) QUOTE(Racer Chris @ Oct 21 2014, 04:35 PM) QUOTE(Mark Henry @ Oct 21 2014, 03:27 PM) You also could have gone 94 and had the crank done a hair longer stroke No, the rules allow 1.2mm overbore, but no change in stroke. I agree with chris If this discussion is SCCA Solo... here's an interesting change for 2015 in DP. Per Appendix A for DP... Engines with 2-valves per cylinder: 1.00 x listed displacement (cc) Engines with 2-valves per cylinder are permitted a displacement change of +10% via bore/stroke changes only and with the weight formula accounting for the increased displacement. Which should super cede 17.10 ENGINE - DRIVE TRAIN... H. Block 1. The block may be rebored no more than 0.0472” (1.2 mm) over standard unless otherwise specified in Appendix A. So if my math is correct... if you replace OEM 94mm jugs with 96mm and keep the same stroke that's 1971cc to 2056cc with a 4.3% increase. Correct? But that prepared car would need to weigh in at 2056 lbs. vintage racing... usually to older SCCA GCR's |
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| Han Solo |
Feb 4 2015, 11:56 AM
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#7
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Member Group: Members Posts: 288 Joined: 30-September 13 From: Middle Tennessee Member No.: 16,456 Region Association: South East States |
QUOTE(brant @ Feb 4 2015, 11:45 AM) vintage racing... usually to older SCCA GCR's Copy that. I was surprised and pleased with this change for us. Especially seeing how I've already bought into 96mm (IMG:style_emoticons/default/piratenanner.gif) Heck, with those rules you could do 98mm (with the same stroke) and still be legal (IMG:style_emoticons/default/smile.gif) |
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Posts in this topic
Seabird 95mm pistons anyone? Oct 20 2014, 01:48 PM
Bob L. Never heard of 95mm. 96mm is easily available and ... Oct 20 2014, 01:59 PM
Randal
Never heard of 95mm. 96mm is easily available and... Oct 20 2014, 04:29 PM brant Good for you for trying to go the legal route.
A... Oct 21 2014, 04:57 AM Seabird
Good for you for trying to go the legal route.
... Oct 21 2014, 05:56 AM Seabird Brant,
That worked out perfect. Don at EBS quote... Oct 21 2014, 01:54 PM bam914 Order them from Charles @ LN Engineering. That is... Oct 23 2014, 10:14 AM flmont who does this cylinder boring,..and do they need t... Aug 24 2015, 09:59 PM stugray Slightly still on topic:
Where can you get a NEW F... Aug 29 2015, 11:32 AM HAM Inc
Slightly still on topic:
Where can you get a NEW ... Aug 29 2015, 01:51 PM |
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