Rebuilding a QR25 Part 3
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- Опубліковано 10 вер 2024
- Presented by William Perdigon of WRP Technology we are covering rebuilding a QR25 in a driveway. In this series we cover all aspect of this engine and whats needed in order to build a reliable street motor.
I've rebuilt probably 4 engines and this is the best video that I have seen by far!! The proper terminology is being used, it's very descriptive, and Mr. Perdigon explains the process in way that most everyone can understand. He even explains the tools being used and why. Excellent video!!! I would like to see the pistons being installed. Thank you, Brian
TRUE!
YES!!! Technical terminological. Long Live the Car Nerds
great video while i study for my a1 recert thanks!
I've just subscribed, good job sir.
Thank you very much for the kind words. I try to be informative when possible in a way that people have an ability to know nothing yet understand everything when it's all done. I will be show casing a new build we are completing next spring. So keep an eye out for out next build =)
Thanks,
William Perdigon
Taper is usually at its greatest at the top of ring travel because that's right at where most of engine wear happens - right when the fuel & air mixture goes bang !!!!
That's why the ring gap measurement is done at the bottom which is the most unworn part of the cylinder.
I've had no trouble running stock 70,000 kilometre old RB25DE pistons in a 300,000 kilometre RB30 engine block, they are a tough motor & the new rings were a tight fit in the cylinders.
The engine has done 200,000 kilometres since the build & is still good.
I have another RB30 engine block & I'm unsure of how many kilometres its done,all I know is that I put 230,000 kilometres on it in 5 years & we bought the car with 227,000 kilometres on the odometer, but the pink writing on the valve cover told me it wasn't the original engine.
It has a maximum of 0.117mm of piston to bore clearance so needs 0.020" oversized pistons & a rebore.
Maybe it's done close to 1,000,000 kilometres.
great video..,. getting ready to install my turbo kit and i need to put a new set of pistons, rings, and rods, in before i throw the turbo in. Im burning about a quart every 300 miles now. it was every 600 about 4 months ago. so this video was a great example thanks for the info. if u could PM me with any other info that would be great. compression test came back good.
Thanks, let me know if there is anything I can help you with =)
Thank you for the refresher. Now I'm confident I didn't miss a single step. I am curious as to why you used a ball hone instead of flat stone hone ? I would think to reduce tapper u would use flats but.....
Ball hone is better for even honing imo, but I could be wrong. That engine turned out great though :)
Ask any question you want
i have sooooo many questions
I remember you from the old B15 community. Do you still have your spec v?
I do, just drive it on occasion, but it lives:)
@@WRPTechnology I'd like to see it in a new video.
I'm doing the same to my Altima 2003 qr25 and I have some questions
1: is it qr25 the same as qr25de?
2. What brand of brand of main bearings and piston rings would you suggest me?
What type of oil should I put once For the first start up? Thank you sir!
1. yes it's the same engine
2. factory bearings are fine, order from your local dealership
3. amsoil break in oil is what i suggest.
sir thank you! i'm sorry to bother, i am having big troubles checking my cylinder bore. could you make a video of how to use the bore gauge. thank you
ha, true story
Flex-hones are already over sized for the application you order for. A 3.5 inch hone is slightly oversize to accommodate that size cylinder, so your 3.75 is over-sized as well, and too big for that cylinder. Flex-hone also recommends 10-30w motor oil as a lubricant, WD-40 is too light. I'm not trying to be de-grading or anything, but why did you use the size you did and the WD-40? The information above is literally on the side of that box you had.
Remove that engine...Put on engine stand
I was broke at the time, and was rebuilding it in the car. Engine came out fine!
Atv more atv lol