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Search found 101 matches

by donclark
Fri Nov 08, 2019 9:59 am
Forum: Engine Tech
Topic: another balance question
Replies: 11
Views: 650

Re: another balance question

I put pistons that were 45g heavier in a motor without a rebalance. It turns 8200rpm & looks mint on pull down. Just run it, you'll never know the difference. This was also the opinion of the man that did the original balance. His shop serviced engines for several ARCA teams back in the day. If you...
by donclark
Thu Nov 07, 2019 2:17 pm
Forum: Engine Tech
Topic: another balance question
Replies: 11
Views: 650

Re: another balance question

SBF, 3.25 stroke
by donclark
Wed Nov 06, 2019 8:44 pm
Forum: Engine Tech
Topic: another balance question
Replies: 11
Views: 650

another balance question

New pistons came in 17 gr heavier @411 gr. with rings. The old pins weighed 106 gr @ 0.787 x 2.250 x 0.200, H13. There is an H13 DLC 0.180 wall tapered pin available that weighs 91 gr. Problem solved. My questions are: a) is this enough pin and b) is 17 grams even enough to be concerned about. Total...
by donclark
Mon Jul 08, 2019 12:21 pm
Forum: Engine Tech
Topic: 7* vs 10* valve locks
Replies: 35
Views: 1495

Re: 7* vs 10* valve locks

little off topic, but I used to use Comp 10 degree keepers a lot. I had a couple sets that when assembling the head and you snapped the valve spring compressor by accident, the keeper would fracture and crack. I would remove the keepers buy a different brand, and never have the same issue. I took i...
by donclark
Wed Sep 26, 2018 11:12 pm
Forum: Engine Tech
Topic: p/v clearance
Replies: 21
Views: 2516

Re: p/v clearance

Grandson is 23, he can see at night and doesn't get tired after 8:00 pm. Not the smoothest pass, we raised the wheelie bars and tightened the rear shocks for the next run and it picked up 0.01. Still too much clutch in it but we are getting there.
by donclark
Wed Sep 26, 2018 10:19 pm
Forum: Engine Tech
Topic: p/v clearance
Replies: 21
Views: 2516

Re: p/v clearance

by donclark
Wed Sep 26, 2018 3:52 pm
Forum: Engine Tech
Topic: p/v clearance
Replies: 21
Views: 2516

Re: p/v clearance

anyone know how to post a video from facebook messenger?
by donclark
Wed Sep 26, 2018 3:26 pm
Forum: Engine Tech
Topic: p/v clearance
Replies: 21
Views: 2516

Re: p/v clearance

N/A, Liberty Equalizer five-speed. I will try to post a link to video.
by donclark
Tue Sep 25, 2018 4:07 pm
Forum: Engine Tech
Topic: p/v clearance
Replies: 21
Views: 2516

Re: p/v clearance

Mocking up for piston to valve clearance on a new combination. For various reasons, the 3.275" stroke crankshaft I will be using will not available for some time. I have a 3.1" stroke crank I can use. The question is will the longer stroke crank change the p/v clearance appreciably? Both will end u...
by donclark
Mon Jun 25, 2018 6:04 pm
Forum: Engine Tech
Topic: How hard on an engine is hitting the rev limiter
Replies: 27
Views: 3415

Re: How hard on an engine is hitting the rev limiter

David Reher weighed in on this several years ago, basically saying that laying on the rev limiter during a burnout destroys engines. I instilled in my grandson early on if you cannot do a burnout without touching the rev limiter you have no business driving a drag car. That was seven years ago and ...
by donclark
Thu Jun 21, 2018 12:04 pm
Forum: Engine Tech
Topic: How hard on an engine is hitting the rev limiter
Replies: 27
Views: 3415

Re: How hard on an engine is hitting the rev limiter

David Reher weighed in on this several years ago, basically saying that laying on the rev limiter during a burnout destroys engines. I instilled in my grandson early on if you cannot do a burnout without touching the rev limiter you have no business driving a drag car. That was seven years ago and I...
by donclark
Tue Apr 24, 2018 2:51 pm
Forum: Engine Tech
Topic: 1.850" rod bearings
Replies: 9
Views: 797

Re: 1.850" rod bearings

#1 What rods are you using? The 1664 fits a housing bore of 2.008" The 1798 fits a housing bore of 1.976" Which do you have? Or are you going to rework the rods? #2 Exactly how wide is the flat portion of your rod crank journal. Not side to side, I'm talking about the flat portion between the fille...
by donclark
Tue Apr 24, 2018 2:34 pm
Forum: Engine Tech
Topic: 1.850" rod bearings
Replies: 9
Views: 797

Re: 1.850" rod bearings

#1 What rods are you using? The 1664 fits a housing bore of 2.008" The 1798 fits a housing bore of 1.976" Which do you have? Or are you going to rework the rods? #2 Exactly how wide is the flat portion of your rod crank journal. Not side to side, I'm talking about the flat portion between the fille...
by donclark
Tue Apr 24, 2018 10:34 am
Forum: Engine Tech
Topic: 1.850" rod bearings
Replies: 9
Views: 797

Re: 1.850" rod bearings

#1 What rods are you using? The 1664 fits a housing bore of 2.008" The 1798 fits a housing bore of 1.976" Which do you have? Or are you going to rework the rods? #2 Exactly how wide is the flat portion of your rod crank journal. Not side to side, I'm talking about the flat portion between the fille...
by donclark
Tue Apr 24, 2018 9:52 am
Forum: Engine Tech
Topic: 1.850" rod bearings
Replies: 9
Views: 797

1.850" rod bearings

Looking at rod bearings for a new build, 1.850" journals. Mahle lists two bearings, the differences I can see is the 1664 is 0.100" narrower @ 0.655" and 0.032" larger OD than the 1798. Both are available with 0.001" extra clearance if required. Anyone have experience with either of these bearings? ...