rod bolt mics /stretch gauges



rod bolt mics /stretch gauges

Postby grumpyvette » December 31st, 2008, 5:02 pm

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Do not assume all the rod bolts will all take the same torque to get to the specified listed stretch
http://www.precisionenginetech.com/tech ... ch-part-1/
http://www.precisionenginetech.com/tech ... ch-part-2/
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ARP ROD BOLT STRETCH AND TORQUE VALUES
(Note: The following list refers to specific ARP rod bolt part numbers. As space does not permit us to list all engine applications here, we’ve limited this sample list to Chevy, Chrysler and Ford applications. Check with ARP for stretch data for other engine brands)

ARP P/N……….STRETCH (IN.)……….TORQUE (LBS./FT.)

CHEVY
131-6001……………0.0062……………40
132-6001……………0.0062……………40
132-6002……………0.0057……………25
133-6001……………0.0064……………50
133-6002……………0.0068……………40
134-6001……………0.0062……………40
134-6002……………0.0061……………50
134-6003……………0.0063……………50
134-6005……………0.0063……………50
134-6006……………0.0055……………45
134-6401……………0.0062……………40
134-6402……………0.0066……………50
134-6403……………0.0063……………50
135-6001……………0.0080……………75
135-6002……………0.0063……………50
135-6401……………0.0080……………75
135-6402……………0.0064……………50
234-6301……………0.0064……………40
234-6401……………0.0070……………40
234-6402……………0.0055……………45
234-6403……………0.0065……………50
235-6401……………0.0075……………60
235-6402……………0.0070……………45
235-6403……………0.0075……………60

CHRYSLER
141-6001……………0.0063……………50
141-6401……………0.0064……………50
142-6001……………0.0069……………50
142-6002……………0.0063……………50
144-6001……………0.0063……………50
144-6401……………0.0063……………50
145-6001……………0.0072……………75
145-6002……………0.0063……………50
145-6402……………0.0064……………50
244-6401……………0.0072……………55
245-6402……………0.0075……………50

FORD
150-6004……………0.0063……………50
150-6005……………0.006……………50
150-6404……………0.0064……………50
151-6001……………0.0065……………40
151-6002……………0.0065……………40
151-6003……………0.0050……………26
151-6004……………0.0055……………22
151-6005……………0.0049……………36
152-6001……………0.0071……………50
152-6002……………0.0063……………50
153-6001……………0.0069……………30
153-6002……………0.0063……………32
154-6001……………0.0063……………50
154-6002……………0.0069……………30
154-6003……………0.0063……………50
154-6004……………0.0055……………50
154-6005……………0.0063……………50
154-6402……………0.0069……………28
154-6403……………0.0064……………50
155-6001……………0.0063……………50
155-6002……………0.0063……………50
155-6003……………0.0063……………50
200-6001……………0.0045……………60
250-6404……………0.0063……………50
251-6201……………0.0047……………30
251-6301……………0.0061……………44
251-6402……………0.0065……………38
254-6402……………0.0070……………25
254-6403……………0.0065……………45
255-6402……………0.0062……………40
- See more at: http://www.precisionenginetech.com/tech ... YFppB.dpuf
SUMMIT SELLS ROD BOLT STRETCH GAUGES
http://www.summitracing.com/parts/ARP-100-9942/

http://store.summitracing.com/partdetai ... toview=sku
read these related links also

viewtopic.php?f=50&t=1027&p=1902#p1902

viewtopic.php?f=50&t=342&p=418&hilit=+wrench#p418

viewtopic.php?f=50&t=1268

viewtopic.php?f=50&t=1222

viewtopic.php?f=53&t=88

viewtopic.php?f=53&t=1916

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http://store.summitracing.com/partdetai ... toview=sku

heres a stretch chart

http://www.arp-bolts.com/Tech/TechTorque.html

viewtopic.php?f=50&t=342&p=418&hilit=+wrench#p418

heres the short version,AFTER each rods installed with its bearing on the crank, during the short block assembly process,set the stretch gauge to zero on the bolts outstretched length, you use a torque wrench on rod bolts lubed with assembly lube too tighten each of them in several stages, tighten the rod bolts to the recommended torque then loosen them and re-tighten them a minimum of three times each, after the final torque value is reached for the third time, you check each bolt against the chart values, most will be a bit short,of the full permitted stretch value, while the bolts being measured , you can slip the stretch gauge off for a second and use the correct long wrench to further tighten them slowly and carefully too just under or up too the stretch chart limits in length, if they are not at that length due to the torque wrench stretching the bolt,this insures max clamping loads, without exceeding the bolts elastic limits so its at max holding strength for the application. cycling the bolt thru several cycles tends to make sure its firmly seated and fully stretched and tends to find problems like defective bolts, and bolt that doesn,t shrink back below the chart value when the tensions released is defective and needs replacement


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FROM ARP

"We highly recommend using a stretch gauge when installing rod bolts and other fasteners where it is possible to measure the length of the fastener. It is the most accurate way to determine the correct pre-load in the rod bolt.

Simply follow manufacturer’s instructions, or use the chart on page 25 of the ARP catalog for ARP fasteners.

Measure the fastener prior to starting, and monitor overall length during installation. When the bolt has stretched the specified amount, the correct pre-load, or clamping load, has been applied.

We recommend you maintain a chart of all rod bolts, and copy down the length of the fastener prior to and after installation. If there is a permanent increase of .001˝ in length, or if there is deformation, the bolt should be replaced. "

http://www.carcraft.com/techarticles/11 ... index.html


a few more less expensive tools

http://www.chevyhiperformance.com/techa ... rices.html

viewtopic.php?f=59&t=1390
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

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Re: rod bolt mics /stretch gauges

Postby grumpyvette » June 20th, 2009, 8:48 am

if your building engines frequently this is a tool that will allow you to get things exactly correct!
that's not always 100% mandatory, in this case
If you only have a decent torque wrench and you think you need a rod bolt stretch gauge, Id point out that hundreds of thousands of engines are assembled and run very successfully being assembled with a torque wrench, a stretch gauge is great, but its hardly cost effective on a one time engine build,
just use a torque wrench and ARP rod bolts coated in marvel mystery oil,
and tighten the rod bolts, in 3-4 stages to full spec torque, three times and loosen them twice so on the last cycle they are brought up to spec torque, this smooths out the tread surface, removes burrs and tends to help consistency, Ive double checked the rod bolt stretch gauge readings against against the torque wrench results many times, you'll save a lot of head aches and you'll be close to correct stretched length on the third cycle or any past that number, bolts tend to stabilize under repeated tension as long as their not over stretched, and the suggested torque wrench settings will not over stretch them, it will generally put you at about 5%-7% less clamp force but certainly far exceeding stock fastener specs, for BOTH consistency and strenght ,but you can,t just add that to the torque wrench setting , or you'll get erratic results,and potentially over stretch the bolts in rare cases
http://www.amazon.com/PREMIUM-OUTSIDE-M ... B000ZJPR5E

http://www.amazon.com/dp/B000JMW4AS/ref ... B000JMW4AS


WATCH THIS VIDEO
NEVER USE A TORQUE WRENCH LIKE A BREAKER BAR TO LOOSEN BOLTS as it TENDS TO QUICKLY DESTROY ITS ACCURACY & consistency

http://www.youtube.com/watch?v=zgwwOJ0B ... r_embedded

http://www.norbar.com/Products/tabid/54 ... fault.aspx


barely functional, and not trust worthy in my opinion
http://www.northerntool.com/shop/tools/ ... _200263474

http://www.harborfreight.com/1-2-half-i ... h-239.html


common, and reasonably accurate
http://www.sears.com/shc/s/p_10153_1260 ... 944593000P

http://www.homedepot.com/h_d1/N-5yc1vZ1 ... ogId=10053


better
http://www.google.com/products/catalog? ... E4Q8wIwAw#

much better
http://www.sears.com/shc/s/p_10153_1260 ... 0001&aff=Y

http://buy1.snapon.com/catalog/item.asp ... ir=catalog
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

User avatar
Site Admin
Site Admin
 
Posts: 14105
Joined: September 14th, 2008, 1:40 pm
Location: florida

Re: rod bolt mics /stretch gauges

Postby grumpyvette » December 7th, 2010, 7:43 pm

IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

User avatar
Site Admin
Site Admin
 
Posts: 14105
Joined: September 14th, 2008, 1:40 pm
Location: florida



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