Jump to content

An extensive refurbishment of the high-performance S65 V8 engine with enhanced power output.


Recommended Posts

Following a year of using the VF620 Supercharger Kit on my 2008 BMW M3 e92, I have made the decision to dismantle the engine and implement enhancements aimed at enhancing its reliability and maybe achieving superior performance.

I am composing this essay with the intention of seeking recommendations on the optimal components to include in my engine repair. The vehicle will be used for both street and racing purposes. Please provide me with your sincere evaluation and recommendations.

I own a pre-existing collection of Arrow connecting rods. The crankshaft will achieve complete balance with the acquisition of all the necessary components in accordance with the specifications.

The further enhancements that I want to install on my S65 engine are as follows:

A comprehensive set of valve springs that have been enhanced for improved performance.
I have observed the SCHRICK HIGH-PERFORMANCE VALVE SPRING KIT. In your opinion, do you believe them to be the optimal choice? Could you recommend other brands?

I am considering the use of a complete piston set manufactured by Mahle. However, I am now uncertain as to whether I should choose for the 4032 or 2618 forged pistons. Additionally, I am also undecided between using the original 12.2:1 compression ratio or the alternative 10.1:1 compression ratio.
The bores were meticulously measured and are in excellent condition, with a bore size of 92mm. Could you kindly provide advice, please?

I am considering the use of 12.1:1 compression ratio (CR) pistons in conjunction with a 1.3mm thick head gasket sourced from FCP Engineering, with the intention of slightly reducing the compression ratio. Kindly provide guidance or recommendations.

The topic of discussion pertains to rod bearings. Presently, I am examining two potential options for bearings: the polymer-coated bearings manufactured by King Racing and the lead-indium racing bearings produced by Mahle Motorsport. Kindly provide guidance or recommendations.

Which options would you recommend? Could you kindly provide any other recommendations?

The whole gasket set is sourced from either Elring or Victor Reinz. Which option would be selected?

I am replacing the original head bolts with ARP head studs. Kindly provide guidance or recommendations.

The following enhancements are under consideration for implementation during the engine overhaul process. Could you provide any recommendations for the use of the VF620 supercharger kit from VF Engineering in street/race scenarios?

Please do not hesitate to provide me with alternate items to the ones mentioned above. Additionally, if you are aware of any websites that are now giving discounts, I would really appreciate it if you could kindly indicate them.

I express my gratitude in advance.

Link to comment
Share on other sites

One may confidently rely on the reliability and performance of Mahle standard and motorsport components. Reinz is consistently our preferred option for gaskets.

It is advisable to thoroughly evaluate the performance of Schrick springs prior to their installation in order to ensure optimal results.

The compression ratio is contingent upon the desired boost level and the configuration of the fuel system. To get information on gasket thickness variations, it is advisable to consult with Mike Tanski, an expert at Ferriday Engineering. The individual has the capability to fabricate a decompression plate or a solid copper gasket in a range of dimensions.

One might perhaps explore the option of using improved valves or alternatively, modifying the existing standard valves and their corresponding seats. The use of a 4 or 5 angle seat and backcut on the valves has the potential to provide a significant improvement.

Link to comment
Share on other sites

Thank you for providing your feedback. I really like the opportunity to engage with the S65 engine as a novice.
Regarding the increase, it will range from 7 to 9 pounds per square inch (psi). I discovered a head gasket with a thickness of 1.3mm, which I am contemplating using in conjunction with Mahle pistons that have a compression ratio of 12.2:1, as opposed to the original ratio of 12.0:1. This adjustment is intended to compensate for the anticipated refreshment of the cylinder heads.
Regarding the valves, I want to do a minimum of triple valve angle seating. However, I will consult the engineering company with whom I will be collaborating to inquire about your recommendation. I kindly request that you provide further information, as it would be very appreciated.
Regarding the valve spring kit, could you recommend any other manufacturers or configurations?
Would you recommend that I pursue an other course of action?
I express my gratitude one again.

Link to comment
Share on other sites

We have operated the system at a pressure of 9-10 pounds per square inch (psi) with a compression ratio of 12:1, and have not encountered any significant problems. If the fueling is sufficient for the task at hand, it does not pose a significant concern. We were able to achieve a maximum pressure of around 12 pounds per square inch (psi) in the final result.
One potential strategy to mitigate the decline in credit rating is to consider engaging in the distribution of methamphetamine.
It is also advisable to consider the crown thickness of the pistons and consider having them machined to reduce their size. As a general approximation, it is recommended to consider 1mm as equivalent to 1 compression point.

When considering springs, it is advisable to adhere to the brand Schrick. They also manufacture high-quality valves. A colleague of mine is now using them on his high-performance Renault 5 turbo, which has an impressive power output of 1000 brake horsepower.

Link to comment
Share on other sites

Thank you once again for your response.

Considering my decision to get the Mahle PowerPak forged pistons, which possess a distinctive coating, I am contemplating the possibility of abstaining from piston machining and instead using a thicker head gasket. What is your opinion on the matter at hand?
Regarding the rod bearings, would you suggest the Lead-indium bearings from Mahle MotorSports as a suitable option?
I kindly want your recommendation on the matter of valve seating.
I express my gratitude one again.

Link to comment
Share on other sites

I must own that I first believed the powerpacks were just covered on the skirt. However, I may be mistaken since my examination has mostly focused on the diesel variants.

The Mahle large ends are a reliable choice. To optimise the design of chairs, it is advisable to include many angles throughout the cutting process. Please attempt to approximate any similar measurements as closely as possible to a radius.

It may be prudent to contemplate the use of bigger values. Schrick offers a universal option that may be custom machined to accommodate the desired head size.

Link to comment
Share on other sites

I have been contemplating the installation of thicker head gaskets. The Mahle PowerPak forged Pistons used in the engine have a diameter of 92mm and a compression ratio of 12.2. Additionally, the cylinder heads will undergo a surface refreshing process. The engine is further fitted with the VF620 supercharger, which provides a boost of 7 psi. What recommendations do you propose?
In addition, during my browsing endeavours, I came across a product from Cometic that provides a thicker alternative. However, it is worth noting that these options are available in dimensions of either 93 or 94 mm, while the original product is 92 X 0.027 inches.
Is it OK to get a 93 or 94mm component in lieu of a 92mm component?
I express my gratitude.

Link to comment
Share on other sites

I will proceed to get the measurements from the gaskets that have been removed, and thereafter verify their accuracy.

Regarding the charger kit, the specific model I own (VF620) is equipped with a charge cooler. In warm climatic conditions, I have seen that the effectiveness of the system is compromised due to the consistently elevated intake air temperature (IAT) exceeding 60 degrees Celsius. This observation is disheartening. The air cooler is located inside the aluminium intake plenum, which is positioned above the engine. I am curious in the potential temperatures that may be attained in the absence of a charge cooler.

Link to comment
Share on other sites

The size of the charge cooler radiator included in the kit is quite small, which raises concerns over its proportionality to the price charged for the product.

The desired objective is to acquire a charge cooler radiator with the maximum possible dimensions that may be accommodated. It is essential to ensure the use of a reliable pump, albeit the specific kind of pump being supplied remains unknown.

Link to comment
Share on other sites

I purchased the most expansive radiator available, which spans the whole vertical length, although its effectiveness remains suboptimal. Given that the ambient temperatures exceed 86°F, it is unsurprising that the efficiency is compromised.

Regarding the head gaskets, the original ones were measured to have a size of 94mm.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...