| Author |
Message |
John Rigby (24.174.236.244)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, August 10, 2003 - 8:28 am: | |
My 04/671 has had the old style staight N-70 (12 years old )I am ready to change them out to the new style.The timing on the engine is advanced for the N injector/
Does anyone have any input on what size and tpe I shold replace the with. Also who would have the best prices??
Thanks
John Rigby |
FAST FRED (67.75.111.174)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, August 10, 2003 - 2:08 pm: | |
John , I believe Da book calls for advanced timing for any injector from 65 up, so if its advanced it's for the amount of fuel being inserted , not the tip style.
Rebuilt injectors are $55 each at the injector shop here in high priced CT.
Have seen "genuine DD rebuilt " for about $43 from mail sources.
What prices are you getting?
FAST FRED |
Geoff (Geoff) (66.238.120.117)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, August 11, 2003 - 1:57 pm: | |
Unless you are changing the head you must stick to the same injector body. What you have now is HV-7's drilled out and converted to N-70's, which means someone must have upgraded the pistons to the "N" series and advanced timed it 12 years ago. This is (was) such a common practice that you can still buy rebuilt injectors with the old body style in the "N" series. People who deal with marine diesels would have these sitting around. |
FAST FRED (67.75.110.92)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, August 12, 2003 - 6:06 am: | |
Geoff , My Greymarine 6-71 diesel is untouched from 1944! (it sat in the can for most of those years ).
Rated 225HP at 2100rpm with advanced timing as all the Navy rated engines had.HN90 installed
Will I have a problem if I downsize the injectors from HV90 to HN 60 , and not touch the engine otherwise?
HV 60's are still avilable , so if the N tips are a problem , its no problem.
How does "better" atomization " (from newer N tips ) need different pistons?
FAST FRED |
Geoff (Geoff) (66.238.120.103)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, August 12, 2003 - 9:54 am: | |
You have to stick with the HV's, Fred, unless you change the pistons to the "N" style. |
FAST FRED (67.75.107.90)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, August 12, 2003 - 3:10 pm: | |
Great info, Thanks ,
Will get the HV 60's and save $$$ core charge .
But still wondering why different injectors require different pistons?
I can understand the big injectors need for A timing , but not this, just wondering?
FAST FRED |
John Rigby (24.174.236.244)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, August 12, 2003 - 8:43 pm: | |
Are the old style N series strieght injectors the same as the new style N offset injectors?
John |
FAST FRED (67.75.111.190)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, August 13, 2003 - 5:51 am: | |
The HV injectors are the "old" straight style , and to NOT have to purchase a new rocker arm & new jumper tubes , the rebuilder modifyes the guts to accept the "modern" N style guts.
The injector shoppe has no knowledge of the need for different pistons , they have been selling them as an "upgrade" with better fuel milage and less visable smoke , mostly to fishing boats & in gen sets.
FAST FRED |
John Rigby (65.112.227.94)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, August 13, 2003 - 9:59 am: | |
Fred I am in need of more info and perhaps rebuilds, could I ask that you email me the shops phone #.
Thanks
John
johns4104s@yahoo.com |
JohnRigby (24.174.236.244)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, August 13, 2003 - 8:25 pm: | |
Fred the pricws I am getting without a core are $114.50.
I visited the S and W Bone yard in houston and picked up 6 cores at $10.00 each.
John |
Tuck-04 (64.53.32.89)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, August 18, 2003 - 3:22 pm: | |
I have a set of HN-70s that I bought "New" rebuilt with less than 10K on them. I replace them with N-60s because the 70s were smoking so much black smoke. I also thought I might pick up a few MPG more. With the N-60s it doesn't smoke any now but I picked up very, very little MPG if any. I have prob put about 20 K plus on the N-60.
But I am only getting 7-8 MPG. But I am geared at 4.125 rearend and top speed is 65-67 @ 2250 rpms. But I don't know if I want to part with the HN-70s or not. I have a 671 4 Valve I want to rebuild and I already have the rocker arms for the HN type.
Tuck |
FAST FRED (67.75.109.208)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, August 19, 2003 - 6:18 am: | |
Bring the cruise RPM down to 1950 and the fuel milage will shoot up.
FAST FRED |
Tuck-04 (64.53.32.162)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, August 19, 2003 - 12:13 pm: | |
I always drive between 57 mph 1850 rpm and 60 mph 1950 rpms and that is where I get the 7- 8 mpg |
John Rigby (65.112.227.94)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, August 19, 2003 - 1:17 pm: | |
Tuck
I think I also have the same rear end and cruise at 70/73 2150/2250rpm on load and with my 7kw powertech pulling from the same tank I get 6-8 mpg
On diging futher the striaght N-70s I have were a replacment for the HV-70 in the 1970s.My timing is advanced and no matter how I drive, or if its in the mountains or on the flat land IT WILL NOT SMOKE.It will heat up but and the hotter it gets the less power, but it will not smoke.
John |
Tuck-04 (64.53.32.106)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, August 21, 2003 - 12:21 am: | |
If you can cruise at 73-74 mph @ 2250 rpms you probably have a 3.56 rearend. |
FAST FRED (67.75.113.68)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, August 31, 2003 - 5:24 pm: | |
Took a while , but the new issue of Boats & Harbors finally came.
Master Mechanic 1.800.877.8350 is offering Remanufactured Detroit injectors by DDS for $43.00 exchange.
This is best price I have seen , but have no idea on quality of DDS rebuilds.
(the usual disclaimer = NO I dont own the company.)
There price on many items seem very good tho.
FAST FRED |